Need for Expiration on Custom Post Types

It would be awesome if there was a hook I could use in my functions.php document to add custom post types to the list of post types that the plugin appears on. Below is the code I used in a current custom theme I’m building.

global $post;
        if( !$post->post_type OR ( $post->post_type != 'page' AND $post->post_type != 'post' AND $post->post_type != 'classes' AND $post->post_type != 'staff' ) ) return;

https://www.ads-software.com/plugins/simple-post-expiration/