If this is the case, you will need to rekey your door locks. In any of these situations, it is important that your lock isn’t broken or damaged. Otherwise, it is recommended to replace a lock.
Can I Rekey a Lock by Myself?

In short, yes, you can rekey a lock by yourself. To begin the lock rekeying process, you will need to purchase a rekey kit for your brand of lock. The average cost of a rekey kit for a single lock ranges between $50 and $200. Below we have provided step-by-step instructions on how to rekey a lock on your own:

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First, remove the lock from the specific location.
Now, remove the cylinder from inside the lock. The kit will include a tool for removing the C-clip that keeps the cylinder in place.
Remove the key plug.
You will then be able to remove the pins.
Remove the old key and insert the new one.
Insert new pins to adjust the arrangement of the plug in the cylinder.
Finally, replace the C-clip and reinstall the cylinder in the lock.
Check the lock after altering the layout.

Make sure that the brand of the lock matches the brand of the rekeying kit. By hiring a professional locksmith service, you can save both time and money. A professional locksmith can rekey your lock quickly and for about the same price as the tools and rekeying kit you can buy.

By Haadi