First snowstorm of the season in Denver yesterday and today. When my wife got off work at 7:00pm yesterday, the locks on the 85 300td were frozen. Key would not go in all the way. Had to take the light rail home. I tried the locks on the 77 300d this morning. Same problem.
Anyone run into this problem before? What is the most effective solution? I've had frozen locking mechanisms on other vehicles, but they never inhibited the key from going into the slot. I'm thinking that heating up the key with a cigarette lighter might work but I'd like to know if there is another solution people have used.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13