when it's cold out, like 30 degrees , the lock on the drivers side is real hard to unlock , anything i can do to fix this or a new key or new lock ? thanks

Do you mean the lock cylinder, power door lock movement, or the inside lock?

 

nipper

outside , power doorlock movement

Can be as simple as the mechanisim needing lubricating inside the door.

 

nipper

If you a refering to inserting the key in the door and hard turning to lock or unlock the door, try some LOCK-EASE or other type of graphite lubricant made for locks. Chances are the lock cylinder is binding and needs lubrication.

thanks