Ashton's way is the best, but if you can't or won't try it there's one last thing you can try that probably won't work (depends on the lock and the situation). There are key extracters made for locksmiths and one of them is pretty much a short length of coping saw blade in a holder.
When there's room to do it you push the blade into the lock past the broken key and use the teeth to pull out the key. I don't give good odds on this working, but you can try to rig one from a saw blade and see how it does. You'd be better off disassembling the lock or having a pro take care of it.
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