Use all of your senses. Maybe the waitress doesn't eat meat anymore because she's so sick of the smell. Perhaps the bartender hears clanking glasses in his sleep. The workplace is a perfect setting for your story. You can integrate a lot of people into your plot and can really define your characters.
People affect the job.
The job affects the people. Make sure your descriptions are clear enough. A reader should be able to tell what type of setting you're writing about without you having to tell them. This exercise also helps you heighten your sense when it comes to describing your settings. You'll feel it.