In public school in the early to mid 80s I saw a short film that (as best I can recall) ends with a kid hiding in the dark behind a door as extremely bright light from the other side of the door streams through its keyhole. Perhaps the doorknob begins melting--I'm not certain whether this is an embellishment on my part. I think the light source may be aliens.
I don't remember any dialog, but assume it was in English if there was any. I think the character was a young boy, but I'm not sure.
It's not a short film, but the abduction scene from Close Encounters of the Third Kind is similar to what you've described.
Edit: Much longer clip.
You are positively describing the short film called "Zero Hour" which was based on Ray Bradbury's short story of the same name. I used to watch this film repeatedly at the community college where my mother worked and this would have been in the early 80s. The main character, Mink, was an androgynous looking girl. At the end of the film her parents are hiding in the attic when aliens invade through the keyhole. A decade after this film, Ray Bradbury Theater remade it with different actors but it was not as good as the original.
The ending of The Ray Bradbury Theather "Zero Hour" episode is similar, but the adults are the ones hiding. Also, the episode is from 1992, not the early 80's.
I showed that short educational film, “Zero Hour” many times as a middle school English teacher 1970s - 2008. It was black and white and based uponRay Bradbury’s story of the same title. It was almost the same as the later Ray Bradbury Theater version. In BOTH films, the parents hide in the attic.
