My 53 plate stilos key has just stopped unlocking the car from the door it will lock all the time but has only unlocked twice in the last 2 days after a lot of attempts. I have sprayed wd40 into the lock last time it opened but still nothing. The key works fine in the ignition with no problems haven't tried the passenger door yet but was hoping to get to the problem on drivers side before I really need the car. Has anybody had this problem and managed to fix it or is it a garage job?