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TIP:  Frozen doors,  door locks,  and trunk lids- - Rain and condensation that collect around door seals, trunk seals, and in the door locks can freeze in the winter, making opening a door difficult. For preventative measures, some manufacturers recommend applying silicone spray around the rubber door and trunk seals to prevent this problem. The silicone repels water, and keeps out the ice. For the door and trunk locks, a general purpose lubricant such as WD-40 or equivalent sprayed into the keyhole can help prevent freezing. 

TIP: If you work in an office, keep a small can of a spray lubricant, such as WD-40 in your desk during winter months. If your car door and trunk locks are frozen, you will be able to spray lubricant from a warm can to help melt the ice. ( If your trunk lock is frozen, you will not be able to get to the can you keep in the trunk to use it in the doors. ) 

Source:inct.net