More info please.
Do you have snow, rain, ice?
What temps are we talking about?
You may just have a bad drivers side door lock actuator or GM5 relay that is having problems in extreme cold weather.
If you are not having problems with the passenger side under the same conditions, WD40 or other lube may not even be the solution to the root cause, again, you may have a bad drivers door lock actuator that is in need of replacement?
Even if you think moisture may be the culprit, your drivers door lock actuator or GM5 relay may be the culprit.
Suggest you check the 4th link below in my signature.