I have locked my keys in my Ford Falcon EL - Please Help!?

IMy car is in the backyard and Ithe keys are in the ignition. I found a Spare Ford key that I thought belonged to my car and tried it out on my car and accidently locked it, but the same key wont unlock it (my partner says that Ford EB-AU keys will do that on any other Falcon model - lock but not unlock) Anyway I have removed the seal at the bottom of the driver's side window and used a hooked wire and pulled at everything there is to pull but still no luck! Does anyone know any way to get in other than smashing a window and RAA (as these are to expensive) THANKS P.S I have central locking if that makes a difference!