How to replace old Church key locks?

Kari Landuyt
by Kari Landuyt
We have a couple doors from the 1920's which have the old church key style lock in our home. Is there any way of replacing those locks with more modern day style without damaging the doors? I love the hardware, just don't have a key to unlock if someone happens to press the toggle lock buttons on the side of the door. And one door I would like to have a little more secure.
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