Central locking problem on a 2001 vauxhall zafira, any ideas?

The central locking on my car isnt working, it's only just gone like this and i have no idea why. The key just wont unlock the doors, but it will lock them. i've tried both of the keys still nothing. I've also reset both of the keys (key in the ignition, position 2, held lock/unlock the reset) still not working. I have to open the driver door the old way actually using the key then pull all of the switchs up on the inside to open all the other doors. Also once i lock my doors with the key, the boot doesn't lock, so i have to do that with the key aswell, it's really bugging me and any ideas any one has would be great. Thanks