Keep some de-icer in your purse or work desk just in case!
We can get some nasty ice storms here in Pennsylvania. Often we get to our vehicle and find our door handles and locks are frozen shut. Rather than waiting about an hour for your vehicle to warm up (IF you are lucky enough to have an automatic car starter) or destroying the chip in your key by setting it on fire with a lighter try mixing up some homemade deicer or just grab a can of it from the local convenience store or auto supply store. Keep one in the house and one in your office desk, cubby, purse, etc..
1 Quart or so of water
1 – 2 ounces of Isopropyl Alcohol
About 3 drops of Dawn dishwashing liquid.
If it gets REALLY cold jut add more alcohol to the mix.