HELP!! My key is stuck in the door!!

[724x4a/cchevy]

I got to school today and i went to lock the passenger side door. I locked it and went to pull the key out and it wont come out. The lock wont turn to the full vertical position, it stops at about 10:30 and i cant figure out why. I think something broke or came undone inside the door. Does anyone know where i can find a picture for the insides of these doors. Im going to work on it 2nd and 3rd hour. Hopefully i can fix it because that is my ignition key also.