Can't anyone make change here?

I was getting a little worried that I would have nothing to complain about today, but the moron cashier at Chipotle Mexican Grill came through for me. The cost of my tasty burrito bowl was $6.26. I gave the guy $10.31. He gives me $4.04 in return. I then point out to him that he owes me another penny, so he cheerfully gives me another penny and slams the cash register closed. I then patiently explain to him that the whole purpose of giving him that penny in the first place was to get rid of my penny and get a nickel in return. So now I have 5 pennies and he can't exchange them for a nickel because by now the cash register is closed. Unbelievable!