public function delete( $id ) {

		wp_cache_delete( $this->get_cache_key( $id ), $this->cache_group );

		global $wpdb;
		return (bool) $wpdb->delete(  // phpcs:ignore: WordPress.DB.DirectDatabaseQuery.DirectQuery
			$wpdb->prefix . 'lifterlms_sessions',
			array(
				'session_key' => $id,
			)
		);

	}