Take your phone with you
And dress for it, even if just for a few minutes.
People think that just because it does "not feel THAT cold" when they are standing next to the door that they can step out for a few moments. And mostly they are right. Except when you are not.
Almost thirty years ago I was finishing up my shift and went to empty the outside trash. I slipped on a tiny bit of black ice. Tore the devil out of my knee until I could not stand. So I started crawling back toward the door. Kind people driving by saw me, stopped and came to help. I was dressed warmly and still by the time I got back inside I was so cold and in such pain I couldn't remember my own phone number to call for someone to take me to the ER. It was down in the single digits the night I fell.
When you are on the ground the cold sucks all the warmth out of your body and the thinking part of your brain begins to shut down.