Can't open SIM card tray
I'm trying to get the SIM out of my iPhone 5, but the tray won't open. I do not have the official Apple SIM removal tool, but I have a paper clip that's around the same size. I'm giving it some force, but nothing is happening and I don't want to break it. What should I do?
iPhone 5, iOS 6.0.2, White 32GB