Change role when user expires? ‘

function handle_on_expire_default_to_role( $expired_user ) {
//if ( $expired_user->on_expire_default_to_role ) {
//if ( get_role( $expired_user->on_expire_default_to_role ) ) {
//$u = new WP_User( $expired_user->user_id );
//$u->set_role( $expired_user->on_expire_default_to_role );
//update_user_meta($expired_user->user_id, ‘role’, $expired_user->on_expire_default_to_role);
//}
//}
}