I used to work at a clothing store in the mall when I was in college. I only worked during the holiday season because people do so much shopping at that time and stores need extra seasonal help. I've basically worked at all of the different positions in the store but the one I enjoyed the most was door greeter.
It was relatively more easy because all I was required to do was to wait in the front of the store, welcome customers and tell them about the sales as soon as they entered. It can be kind of tough saying the same things over and over again. But it's also nice to interact with people that way. And they usually smile back and say hi.
I would recommend door greeter position especially for those who are social, people friendly and enjoy helping customers. I used to also get a lot of requests to help customers find a particular item or piece of clothing when I was a door greeter. That was nice too because I could make suggestions and it felt good to be helping people.
I was never asked to help with security as a door greeter though. It was a pretty small store so I think our managers preferred to take responsibility for that themselves. All employees were generally warned to watch out for shoplifters anyway and my job didn't require anything more than that.