Laguna estate 04 drivers door will not lock?

Hi, can anyone help I have a Laguna estate 04 reg 1.9dci and for the past 6month I have had to lock the car using the centre consol because both of my key cards broke (lock button popped off), the drivers door started making an unhealthy noise about 1 month ago but kept on working, it now makes a quieter noise and has stopped locking the door. Can anyone suggest a fix? Cheers