Hi guys
Sometimes ive had the same problem and i'll tell you what i think it is,make sure the ignition switch/barell is fully anticlock wise when you pull the key out as sometimes it sticks and it will not let you lock the doors using the plip as it thinks the key is still in the ignition obviously.Try turning ignition on off a few timesand see how you get on,should cure problem!!!!!! :D :D