You know, there are master key systems that do exactly this: you can have a master key that opens everything and special keys for just one of the locks. There are even grandmaster systems with some locks opening subsets of locks. I'm personally a huge fan of a certain Finnish manufacturer but there are many others. You can't usually put one of those compatible cylinders into you car, usually, and there are other limitations, but, still, even just for doors and lockers it's a great thing to have. Also, usually, those expensive cylinders are reprogrammable in case of a compromise and there are other security features (keys being impossible to copy is the one I like most).
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