Driver’s door does not unlock

Hello together, I have a problem with the central locking of my smart. Sometimes the driver’s door does not open when I unlock at the touch of a button – it only opens the passenger’s door. Even the turn signals don’t give a signal. In the workshop I was told that the lock has to be replaced on the driver’s side. What I find strange, though: the trunk can’t be opened either, but only when I open the passenger’s door. The workshop said that there might be another At the moment it usually works again, but I have to press the button several times. Did any of you ever have a similar problem?