public function release( $job ) {
		$data  = array(
			'job'         => serialize( $job ),
			'attempts'    => $job->attempts(),
			'reserved_at' => null,
		);
		$where = array(
			'id' => $job->id(),
		);

		if ( $this->database->update( $this->jobs_table, $data, $where ) ) {
			return true;
		}

		return false;
	}