What will prevent a guy from hitting on you?

Anonymous
I work at a fast food place, and every day I work at least 2 guys hit on me :( I am committed to my boyfriend, no matter what, but I am wondering. Are there any ways to prevent a guy from hitting on you?

The downside is I am required to be nice to them (because they are customers) unless they harass me. I've tried telling them that I have a boyfriend or that I'm taken, but they don't care. I even have repeat customers that try getting my number etc.

Girls, any ideas on how to prevent this?

Guys, what are some things that a girl does or says that make you not hit on her?

anything is appreciated:)
Updates
+1 y
As an experiment for the next week, because my boyfriend will be out of town and I have nothing better to do. I will try the different ideas that people give me, at work, and let you guys know what works and doesn't :)
What will prevent a guy from hitting on you?
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