Method One - Get an old Clutch cable, (with both inner and outer cables) Make a loop on the inner cable at one end, (which will be used inside the car)
Next step is to pull a little of the top door and wedge it with something, this needs to be something like plastic or rubber just enough to get the clutch cable in through the door, insert cable and get loop around the door handle, do this ONLY on the drivers door as the rest will have been dead locked!
Method Two - Jack up car from front, remove covers where neccessary, gain access to the alternator or starter motor, and feed it 12v from a battery charger, this will feed the system with 12v and allow the alarm to be deactivated via remote fob.
Method Three - Put a brick throught drivers window .... LOL
It is worth giving the key and lock a good going as lock is sodded anyway, and it might just give that once to allow to open it, but don't put more force than neccessary, I mean if the metal starts to flex then stop at that point.
Hope this helps matey, cos the guys you call out will use one of these techniques, but won't care as much as you, while on ur baby.
Regards
SARGE