private function processAutoclose($date, $backfill) {
        // Run hourly.
        $lastjob = JobFinder::getLastByQuery(['type' => Autoclose_Job::$TYPE]);
        if(is_null($lastjob) || $date - $lastjob['target_date'] >= 1 * 60 * 60 - 5) {
            $autoclosejob = new Autoclose_Job();