I work in the security industry and spent a few years working as a doorman (doorwoman?) in a busy club district. I enjoyed the heck out of it and consider it valuable experience on my resume. So do industry recruiters, and that has paid off for me financially. Why? Working in such a fast-paced environment where situations can develop at light speed really sharpens your focus and ability to maintain that focus for long period of time. Greeting patrons at the door is great practice in sizing up people and spotting possible trouble. Keeping tabs on the crowd teaches you how to spot breaks in the traffic pattern and step in with a team while the fight is still developing. And, of course, a crash course in police relations.
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Be nice, until it's time to not be nice.