Forgotten 2: The Second Time

This was the second time I got left behind on the way to The Lake. Apparently when they turned around to pick me up, they could hear knocking on the door from the inside of the house. Mom said I was knocking on the door because I couldn't reach the lock.
I vaguely remember being alone in the house and thinking that if you knock on a door to get in, then surely you can knock on a door to get out.