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This has been done many times on this forum but I couldn't find any of the threads,
Anyway on the side of the lock is a small hole which you will need a small punch or pointed tool to stick in that hole, do this with the key in and turn the lock. I use to have a picture of this hole and detailed directions on this but can't find any of it.
I know somebody has the pic still, As soon as they read this they can help further.