Copy a key using a soda can, copier, scissors.

Instructables. What a great site. I did a similar trick after "borrowing" the master key from the departmental secretary.

Who wants to carry around 12 different large metal pointless keys? Get yourself a master key. What does most every place of business have?
Soda machines
Copy machines
Scissors
Crappy security about who gets master keys.

How to make a working duplicate of a door key with a copy machine, soda can, scissors, etc.
Are xerox machines good enough to literally xerox a key put on the glass and have the same dimensions on the output paper? Yes. :)