How to change class method in child theme?

How to change the behavior of the post_tags () method in the file /inc/blog/class-post-entry.php? I created a child theme and I want to override the method. Do not want to change the code in the parent theme. The following code does not work:

function overload_method() {	
    require_once get_template_directory() . '/inc/blog/class-post-entry.php';	
	if (! Class_exists ('Customify_Post_Entry')) {
		class Customify_Post_Entry {
			function post_tags() {
				$html = 'custom text';
				echo $html;
			}
		}
		
	}
}
add_action( 'init', 'overload_method' );