First of all your and idiot.
You'll probably get your job back it all depends on how hard you want to fight for it. They will drag it out as long as they can to make you an example and to see if you'll just quit....
It would have been easier to just work through you lunch and they wouldn't have done much if anything to you.
We had a driver do that, a few years back.....got a nice 30 day, unpaid vacation!
Where do these clowns come from?