I would like to hide the admin menu (Video Tutorials) for

I would like to hide the admin menu (Video Tutorials) for non-Pro Site users. Here’s the code I have so far, but it’s not working:

add_action( 'admin_menu', 'remove_menu_pages' );

function remove_menu_pages() {

global $wpdb;

$userid = get_current_user_id();

if (!is_pro_user($userid) ){

remove_action( 'admin_menu', 'plug_pages' );

}
}

Any help to get this working will be greatly appreciated.

Thanks,

Chris