where can I purchase an emergency entry key for bedroom doors without buying a new set of door knobs?

My 3 year old son has gotten into the habit of locking bedroom doors. Thankfully he has not yet locked himself into a room. I am searching for a tool that will unlock the doors (they have the type of lock that you turn) but would like to avoid replacing all of the door knobs. Any help will be greatly appreciated!

Answers:
Bring the key to the locksmith and have a copy made.

Other answers:
Go to a local hardware store and purchase a small, flat bladed screwdriver. They'll work just as good.
Go to a local hardware store and purchase a small, flat bladed screwdriver. They'll work just as good.
Most bedroom doors are called "privacy doors" and their locks are disengaged from the outside using any straight, thin tool. Often a finish nail will do the trick.
If they are the older style of bedroom door, a small flat screw driver will open them. --- That is about how big it will be, the 3 marks I made there. Might even be smaller. Home depot or Valu home center should have some of the keys also.
in most cases they put a lock that can be opened with a small thin flat head screwdriver, check at lowes or home depot
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