A broken key in the lock is rarely a reason to replace the lock, and a copied key is rarely as simple as 'any key works.'
A key that breaks off flush with the lock face looks worse than it is. In the large majority of cases the broken piece can be removed from the cylinder with the right small tools, without drilling or replacing anything, and the lock goes right back to working with a fresh key cut. The exceptions are usually locks that were already failing before the key broke — worn pins that were binding, which is often what caused the break in the first place.
Duplication is worth being particular about. A copy cut from a worn original carries that wear forward, so a key that already needed some jiggling gets copied along with the jiggle. Cutting from the original manufacturer's blank, or from a key that is itself still sharp, produces a noticeably better copy than duplicating a duplicate. Safes are their own category — a jammed or forgotten-combination safe usually gets opened rather than destroyed, and whether it is worth repairing or replacing after that depends on the safe's condition and age more than anything else.
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