public static function delete_queue( $key ) {
		global $wpdb;

		$meta_key = $key . '_meta';

		$table  = $wpdb->options;
		$column = 'option_name';

		if ( is_multisite() ) {
			$table  = $wpdb->sitemeta;
			$column = 'meta_key';
		}

		$key = $wpdb->esc_like( $key ) . '%';

		$wpdb->query( $wpdb->prepare( "
			DELETE
			FROM {$table}
			WHERE {$column} LIKE %s
		", $key ) );

		delete_transient( $meta_key );
	}