Left a light on in the car last and battery was flat this morning. Neighbour had jump leads and sorted me out. I took the car for a spin to charge up the battery, came home and parked up. Went out two hours later and key wouldn't open the door, spare key the same. Opened the car via the boot, lol and tried key in ignition, no lights on dash. Does the key need to be reprogrammed or could it be a dodgy fuse maybe?