This movie is absolutely terrible. The whole this is just a series of random ideas that don’t tie into one another to create a full fledged plot. It’s like, teenagers in detention get eaten by door, three people or “knockers” go into door for research, never come back out, guy named Jamal communicates with door, then zoom meeting for the rest of the movie. Then roll credits, no explanation, no nothing. If you want to spend time watching something good, do not watch this movie.