/**
  * Pop the next job off of the queue.
  *
  * @param  string  $queue
  * @return \Illuminate\Queue\Jobs\Job|null
  */
 public function pop($queue = null)
 {
     $original = $queue ?: $this->default;
     $this->migrateAllExpiredJobs($queue = $this->getQueue($queue));
     $job = $this->redis->lpop($queue);
     if (!is_null($job)) {
         $this->redis->zadd($queue . ':reserved', $this->getTime() + 60, $job);
         return new RedisJob($this->container, $this, $job, $original);
     }
 }