People I want to Punch in the Face

I work in a shop. Sometimes you get the kind of customers who stroll in a few minutes before closing, saying they're aware what time it is, but they're only going to get a few things. But no matter their words, they go around the shop without any hurry and don't seem to care that the people working would like to go home.
They are so inconsiderate. Are we not human too? Don't we deserve our few precious hours of free time? Yeah sure! We live only to serve you! Why should you care about our plans or our time?

Got so mad today because of a customer like that, and that feeling lasted for quite a while after I got home. Now I only feel depressed. I'm so tired of being annoyed. Of feeling worried. Of being disappointed with life. Why can't life be shiny, Capt'n?