title: Sidekiq - job stuck in enqueued
body: <p>I have a rails 4 app.  I'm using paperclip and delayed_paperclip with sidekiq.  The background job is being picked up by sidekiq but it just hangs forever in the Enqueued queue.<br>
  This is what I see on sidekiq:</p>
  
  <pre><code>{"job_class"=&gt;"DelayedPaperclip::Jobs::ActiveJob", "job_id"=&gt;"946856ca-c90e-4bb4-9f41-1f1e59269acb", "queue_name"=&gt;"paperclip", "arguments"=&gt;["User", 109, "avatar"]}
  </code></pre>
  
  <p>In my User model I have:</p>
  
  <pre><code>  process_in_background :avatar
  </code></pre>
  
  <p>procfile.yml</p>
  
  <pre><code>worker: bundle exec sidekiq
  </code></pre>
  
  <p>I have read all related issues to this question and still couldn't figure out the issue.  Thoughts anyone?  </p>
  
  <p>Thanks.</p>