central locking and boot lock

[Fraz06]

hey guys,

i've got an 89 520i and the central locking is playing up, when i put the key in the driver or passenger side lock and lock the car the car locks and then suddenly re opens itself and also when i put the key into the lock on the boot (trunk) i can't turn the key either way as it won't turn right or left. Any suggestions what could be wrong with the central locking and the lock on the boot(trunk) and how to fix both of these problems?

thanks guys

regards

fraser