This happened to me when I was about 8 and still scares me to this day. One evening I went to let my dogs in from the back garden at around 9pm. It was pitch black so I quickly opened the door and my dogs came bounding in, as soon as they came in I locked the door and at this moment a person on the other side pulled the handle down trying to get into my house. We had a glass door so even in the dark I could see the outline of a man standing there.
I ran to my dad and he ran into the back garden after this man and saw him running down the road. Since then I have closed and locked doors at the speed of light.