In article ,
PaPaPeng wrote:

Cutting your own keys is simple and quick if you have an angle
grinder. I imagine at least some unwanted keys could be trimmed down
to fit existing locks - never tried it though. Definitely something
for the frugal folk.

I attack from the other direction. I buy only Qwik-set locks. usually
at yard sales. they enable you to set the lock to use the existing
keys you have. I was a landlord at the time and had to change locks
of the rentals, once and a while.
Everybody have a great new year!
Patriotism is supporting your country all
the time and the government when it deserves it.
-Mark Twain