A number of years ago a woman put her bag in the boot of her Merc (iirc) and the bag happened to have her keys in it!! They called the AA out who tried numerous things, but couldn't do anything and through the "15mintues tow home" or whatever it is policy he was prepared to give up and tow her home.

I stuck my nose in and started ripping the back seats out looking for a way through. On the back parcel shelf was a hole around 2inches square. It took me an hour, but I used the AA mans long rods and managed to move shopping, get the bag up the front of the boot (It was just inside the boot from the back) and get her keys out of the bag and through the whole!! The woman was soooooo greatful she didn't have to spend much money (Gave me £20 for my effort instead of £100 odd per hour from Merc) or smash the window... (I was in work, so got paid while doing it )

I had alot of people floating about down the high street watching and being nosey and after the woman drove off I heard a few people talking and said "A woman locked her keys in the boot and the AA man got them out" He wanted to tow her off an hour before hand!!

With time and patience you can get out of the old "Lock yourself out" situation. I was even gonna remove a bonded in windscreen once just to get the keys out the ignition (Was a screen fitter at the time)

Glad ya got ya keys out the engine bay tho mate