Post status transition for Job Manager

gistfile1.txt

class My_Job_Manager_Custom_Alerts {
    
    /** 
     * Constructor
     */
    public function __construct() {
        add_action( 'publish_to_expired', array( $this, 'expired_post' ) );
    }
        
    /**
     * Expired post triggered by publish_to_expired hook
     * @param $post post object
     */
    public function expired_post( $post ) {
        // DO THINGS HERE
    }
    
}