You can think about giving the kids one warning before giving them a consequence. Since the kids are not in the lunchroom very long and they usually go to recess after lunch, their consequences could be time outs and shortened recess time. For cases where the kids continue to break the rules after several time outs or docked recess time, then you could think of more creative techniques such as helping you wipe down tables. However, whatever you decide to do, it would be best to talk with your school principal first, just so you are on the same page with the school's discipline policy.
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In our school I've seen "go back and do it again" work well. (The lunchroom monitor asks the child who ran to go back and cover the space again walking). I think that works well because kids realize they're using up their precious free time and they think twice before running again.
I also think it works well to connect with the child's teacher to find out what the discipline system is in the class. If the teacher has a behavior card system, you could speak to her about having the ability to "change a student's card". That way, you're able to impose the same consequences that the teacher imposes.
Of course, it's always a good idea to talk through WHY you're asking the kids to walk (lots of people in the cafeteria, slippery floors in the cafeteria, don't want anyone to get hurt or any lunches to get spilled, etc.)