anyone know where the lock for back up key is on a renault laguna 2003 plate,it has the electronic key cards

there is a small key in the key card which opens the passenger front door lock, you have to prise the plastic cover off of the door handle in order to insert the key. It will only let you open the door, if there is a problem with the locking circuit/key card you will need to take it to a dealer (as opposed to a flat battery which you can charge up).