Beanstalk reserve can't get job from queue!

$queue = new Beanstalk($this->config->queue->toArray());
$queue->connect();
$queue->choose($this->config->queue->tube);
while(($job = $queue->reserve()) !== false) {
    $jobBody = $job->getBody();
    var_dump($jobBody);
    //Remove the job from the queue
    $job->delete();
}

[peekReady] can get jobs, but [reserve] don't give any response.