Instead of getting Content Editors to do this you could look at an solution to Auto-unlock items.

We've implemented a solution for this as a Sitecore Tasks as described by Mike Reynolds here:

https://sitecorejunkie.com/2013/09/28/periodically-unlock-items-of-idle-users-in-sitecore/

We've got it set in config to run every 4hrs:

<?xml version="1.0" encoding="utf-8"?>
<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <settings>
      <setting name="UnlockItems.ElapsedTimeWhenIdle" value="00:04:00:00" />
    </settings>
  </sitecore>
</configuration> 

This works really well for us and avoid content authors leaving items locked and having to manually unlock them.

Instead of getting Content Editors to do this you could look at an solution to Auto-unlock items.

We've implemented a solution for this as a Sitecore Tasks as described by Mike Reynolds here:

https://sitecorejunkie.com/2013/09/28/periodically-unlock-items-of-idle-users-in-sitecore/

We've got it set in config to run every 4hrs:

<?xml version="1.0" encoding="utf-8"?>
<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <settings>
      <setting name="UnlockItems.ElapsedTimeWhenIdle" value="00:04:00:00" />
    </settings>
  </sitecore>
</configuration> 

This works really well for us and avoid content authors leaving items locked and having to manually unlock them.

--Update--

Another option is to allow users to unlock other users items based on a permission you can assign them. Here are two articles explaining how to go about this:

http://www.sitecore.net/learn/blogs/technical-blogs/john-west-sitecore-blog/posts/2013/02/allow-users-to-unlock-items-locked-to-others-in-the-sitecore-aspnet-cms.aspx

https://briancaos.wordpress.com/2010/09/10/unlock-sitecore-items/

We didn't do this but It seems like a nice solution also for trusted content authors.