Illuminate\Queue\Worker::failJob PHP Method

    protected function failJob($connectionName, $job, $e)
    {
        if ($job->isDeleted()) {
            return;
        }
        try {
            // If the job has failed, we will delete it, call the "failed" method and then call
            // an event indicating the job has failed so it can be logged if needed. This is
            // to allow every developer to better keep monitor of their failed queue jobs.
            $job->delete();
            $job->failed($e);
        } finally {
            $this->raiseFailedJobEvent($connectionName, $job, $e);
        }
    }