title: Clockwork won't run a job in the closest full hour
body: <p>I'm using clockwork for running a job every full hour (**:00), like this:</p>
  
  <pre><code>every(1.hour, 'auto lock', :at =&gt; '**:00')
  </code></pre>
  
  <p>But if a add an item for the job, for example at 17:50, the job will run for this item only at 19:00 and not at 18:00 as expected.</p>
  
  <p>What could be the problem?</p>
  
  <p>Thanks.</p>