Appending a protected Object with an array

I have a class that I am using as part of the CMB2 framework for WordPress. It has a protected object that I am trying to append a list of years to. My code looks like this in my function

function cmb2_team_members_metaboxes() {
    global $redux_rg;
    $prefix = '_cmb2_';
    $cmb_team_members = new_cmb2_box(array(
        'id'            => 'team_member_metabox',
        'title'         => __( 'Team Member Metabox', 'rev-group' ),
        'object_types'  => array( 'post_type_teammember', ), // Post type
        'context'      => 'normal', //  'normal', 'advanced', or 'side'
        'priority'     => 'high',  //  'high', 'core', 'default' or 'low'
        'show_names'   => true, // Show field names on the left
    ));

I add more fields then below I am trying to append the years() output to an options list of an HTML select / dropdown. to do this I need to append $cmb_team_members->meta_box['fields']['_cmb_start_year']['options'] with the output array from the function years(). Below is where I am trying to extend CMB2 class which is protected with the years() output.

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class yearsClass extends CMB2
{       
    public function __set($name, $value)
    {
        $this->$cmb_team_members->meta_box['fields']['_cmb_start_year']['options'] = years();
    }
}

I know I am doing this completely wrong but I can’t seem to crack this. Any help would be appreciated.

I have years defined in my functions.php file and it outputs:

array(
    2015 => 2015,
    2014 => 2014
)

When I output the CMB2 Object I get this:

CMB2 Object (
[cmb_id:protected] => team_member_metabox
[meta_box:protected] => Array
    (
        [id] => team_member_metabox
        [title] => Team Member Metabox
        [type] => 
        [object_types] => Array
            (
                [0] => post_type_teammember
            )

        [context] => normal
        [priority] => high
        [show_names] => 1
        [show_on_cb] => 
        [show_on] => Array
            (
            )

        [cmb_styles] => 1
        [enqueue_js] => 1
        [fields] => Array
            (
                [_cmb2_division] => Array
                    (
                        [name] => Division
                        [desc] => The division of the company this person works in (These can be edited in the Revolution Group theme options)
                        [id] => _cmb2_division
                        [type] => select
                        [options] => Array
                            (
                            )

                    )

                [_cmb2_photo] => Array
                    (
                        [name] => Photo
                        [desc] => 
                        [id] => _cmb2_photo
                        [type] => file
                    )

                [_cmb2_position] => Array
                    (
                        [name] => Position
                        [desc] => Job position
                        [id] => _cmb2_position
                        [type] => text
                    )

                [_cmb2_email] => Array
                    (
                        [name] => Email
                        [desc] => Email address
                        [id] => _cmb2_email
                        [type] => text_email
                    )

                [_cmb2_bio] => Array
                    (
                        [name] => Bio
                        [desc] => 
                        [id] => _cmb2_bio
                        [type] => wysiwyg
                        [options] => Array
                            (
                                [media_buttons] => 1
                                [textarea_rows] => 5
                            )

                    )

                [_cmb2_start_year] => Array
                    (
                        [name] => Year Started
                        [desc] => The year the team member started with Revolution Group
                        [id] => _cmb2_start_year
                        [type] => select
                        [options] => Array
                            (
                            )

                    )

                [_cmb2_certifications_repeat_group] => Array
                    (
                        [id] => _cmb2_certifications_repeat_group
                        [type] => group
                        [description] => Certifications (These can be edited in the Revolution Group theme options)
                        [options] => Array
                            (
                                [group_title] => Certification {#}
                                [add_button] => Add Another Certification
                                [remove_button] => Remove Certification
                                [sortable] => 1
                            )

                        [fields] => Array
                            (
                                [certification] => Array
                                    (
                                        [name] => Certification
                                        [description] => Please select
                                        [id] => _cmb2_certification
                                        [type] => select
                                        [options] => Array
                                            (
                                            )

                                    )

                                [certification_year] => Array
                                    (
                                        [name] => Year Obtained
                                        [description] => The year this certification was aquired
                                        [id] => _cmb2_certification_year
                                        [type] => select
                                        [options] => Array
                                            (
                                            )

                                    )

                            )

                    )

                [_cmb2_skills_repeat_group] => Array
                    (
                        [id] => _cmb2_skills_repeat_group
                        [type] => group
                        [description] => Skills (These can be edited in the Revolution Group theme options)
                        [options] => Array
                            (
                                [group_title] => Skill {#}
                                [add_button] => Add Another Skill
                                [remove_button] => Remove Skill
                                [sortable] => 1
                            )

                        [fields] => Array
                            (
                                [skill] => Array
                                    (
                                        [name] => Skill
                                        [description] => Please select
                                        [id] => _cmb2_skill
                                        [type] => select
                                        [options] => Array
                                            (
                                            )

                                    )

                            )

                    )

                [_cmb2_fun_fact] => Array
                    (
                        [name] => Fun Fact
                        [desc] => 
                        [id] => _cmb2_fun_fact
                        [type] => wysiwyg
                        [options] => Array
                            (
                                [media_buttons] => 1
                                [textarea_rows] => 5
                            )

                    )

                [_cmb2_order] => Array
                    (
                        [name] => Order
                        [desc] => Order that the team member should be displayed. The lower the number the hghter on the list when displayed
                        [id] => _cmb2_order
                        [type] => text
                    )

            )

        [hookup] => 1
        [save_fields] => 1
        [closed] => 
        [new_user_section] => add-new-user
    )

[object_id:protected] => 0
[object_type:protected] => post
[mb_object_type:protected] => post
[updated:protected] => Array
    (
    )

[mb_defaults:protected] => Array
    (
        [id] => 
        [title] => 
        [type] => 
        [object_types] => Array
            (
            )

        [context] => normal
        [priority] => high
        [show_names] => 1
        [show_on_cb] => 
        [show_on] => Array
            (
            )

        [cmb_styles] => 1
        [enqueue_js] => 1
        [fields] => Array
            (
            )

        [hookup] => 1
        [save_fields] => 1
        [closed] => 
        [new_user_section] => add-new-user
    )

[fields:protected] => Array
    (
    )

[hidden_fields:protected] => Array
    (
    )

[data_to_save] => Array
    (
    )

[generated_nonce:protected] => 

)

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