text:  And so if you live in a highly dense area and you think that might be a possibility is that you could do a couple of things. You can wrap your key fob in aluminum foil. You can also just take a box and wrap that in aluminum foil and then put your keys on the inside. Some people actually are putting their keys in the refrigerator. I don't recommend you putting them in the microwave because you never know what might happen there.