Add Genesis Sidebar area to Custom Post Template

template-sidebar.php

<?php
/** 
 * Opening PHP tag is likely not needed
 * Functions are added to our custom single post template
 */

//* Hook our sidebar logic to get_header
add_action( 'get_header', 'mytheme_sidebar_function' );

//* Remove the primary sidebar, swap in our custom sidebar
function mytheme_sidebar_function() {
    //* removes primary
    remove_action( 'genesis_sidebar', 'genesis_do_sidebar' );
    
    //* adds custom sidebar
    add_action( 'genesis_sidebar', 'mytheme_do_custom_sidebar' );
}

//* Retrieve our custom sidebar
function mytheme_do_custom_sidebar() {
    genesis_widget_area( 'custom-post-sidebar', array(
        'before' => '<div class="widget-area">',
        'after'  => '</div>',
    ) );
}