So i live i utah where it is snowy and cold. My daughter gave me a 98 crv and in the mornings when it is very cold and icy the front doors will not unlock. They will not unlock with the keyfob or key. I can open the back hatch crawl in pull up the the back door locks and open the back doors from the inside. But i can't even pull up the the front locks from the inside neither. It seems like they are jammed untill later in the day when it warms up then it unlocks from the fob, the key. and the lock from the inside. Any ideas what this could be a sensor or something? Back doors work fine.

 

Moisture in the mechanism
Spray some WD-40 where the lock and mechanism move
This should rid you of the water and its frozen cousin
Then your locks will work as they should