I've done this too, i was out camping with loads of mates. finished unpacking, left keys on dash and locked the car. didnt realise till i got back after 10 mins to thinking where are my keys. look in car, there they where just looking at me. i was about hour away from home, no spare key exists and no breakdown cover. most my mates where already pissed so no help there but thankfully the bf had RAC cover so they came out and got into it nice and easy signed up myself, then got pissed so not as bad as yours