I have a similar problem with mine, the fob unlocks the two passenger side doors and the rear door but not the drivers side doors. Unfortunately i can't get the key in the drivers door, at some point i think the tiny bit of metal that covers the keyhole has been bent at some point. It means i have to lean across and open the drivers door from the inside.
I've had this problem since i bought the car, unfortunately with living in a rural environment then i disn't always lock my car so it wasn't until a week after i bought the car that i noticed the problem after locking the car in a retail park car park. I asked the previous owner about it but he claimed to have no knowledge of the problem (surprise surprise).
I'm not overly bothered about the central locking working, as long as i could unlock the door with the key but i've been told it'll be over £100 to fix at the very least.