I'd just like to voice support for Bushman's point: Locks cost time to bypass, but no lock is impenetrable. Anything you build somebody else can destroy. Assuming the thief has time to work with, no lock can resist methods such as being frozen and smashed with a sledgehammer, or cut with a torch. I think a lot of people, with their focus on door locks, do not fully appreciate that the side of their house is made of half an inch of siding, a couple sticks, styrofoam, and a sheet of drywall. Forget the door, an ambitious thief with a sawzall could be through your wall in a couple of minutes (also bypassing any fancy intrusion systems you might have; did you buy interior motion detectors?)

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