Getting into frozen car door locks?

[BigChris99]

My daughter is going to college in eastern Iowa, gets pretty

cold there in the winter. This is her first year having a car out there. The car is a '99 Toyota Camry. We had to remove

the after market car alarm that came on the car, too many problems. So, she has to manually unlock the doors on her

car, just like most of us did when we were kids. Being from southern California we are not too experienced with freezing

temps. So what is the best way to either keep locks from freezing, or getting into a car that has locks that are frozen?

I suggested she keep a lighter in her purse to warm up her key. Good idea?? You guys that deal with this every winter

must have some things to do or not to do to get her through an Iowa winter.