1987 Other Dodge Models sticking keyhole

Early this morning I got up to go to work and my key would not open the door to my car. Automatically I assumed it was frozen and tried the age old remedy of pouring hot water on it to unfreeze it. When that didn't work, I tried heating up my key with a lighter. Next, I attached an extension cord and my blow drier and tried heating it that way. After standing out in the cold looking like an idiot for about ten minutes blow drying my cars door I decided to try another approach, oil on my key to unstick it inside. None of these worked and I am now half a day late for work and have no idea how to get in my car. I now realize it is not frozen, what could be wrong other than that?