How to buy a new mailbox key?

Okay so long story short I took my mailbox key and went to get the mail and I was in a rush so I kinda bent the key, so i put it back in the keyhole to bend it back but it bent to far, so being in a panic I bent it again and it broke, two pieces. So I replaced it with another mailbox key(it doesn't work for my mailbox) until I figure something to do. Is there I way I can glue the pieces together? and make it work? I need a new mailbox key by tomorrow, but I'm sixteen and I don't know what I have to do to get a key so please anyone help me! My parents CANNOT know that this happened so help is GREATLY appreciated.