Also what sort of plank could lock their keys in the car if it's remote central locking?

This plank did with a hire car, Peugeot 307HDi.
If you open the door as I did to get something out of the glove box and the leave the keys on the seat whilst I fiddled in the glove box, if you also do not put the keys in the ignition and then close the door it will self-lock in 30 seconds.