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sotired said..
Try using a car keyless locking setup, with an actuator and a rod from it.
Jaycar used to sell generic actuators and different rods to clamp to the existing rod in your car's locks. I suspect they don't sell them any more, but I am sure you will find them on ebay.
I think that will work ^^^^^. 12volt transformer, auto car entry system - I wired up my car and it worked a treat, however I didn't need/buy the mechanical actuators - already had them. Cost me $15 on ebay. but I think it would work with a bit of gaffa/cable-ties and some imagination. The systems are available on ebay.
Can't begin to tell you how cool it is to press a button on your keyring to lock/unlock stuff, that used to require manual entry.
1.
http://www.ebay.com.au/itm/Remote-Auto-Car-Control-Keyless-Entry-Central-Door-Lock-Locks-Locking-Kit-System-/121049222117?pt=LH_DefaultDomain_15&hash=item1c2f188be52. 12V transformer - I'm sure you have one lying around, doing nuthin
3. cable ties, gaffa, screws to secure actuator to locking mechanism.
Let us know how you get on - send us pics of your setup when it's done and dusted!