Your characters are a person who is locked out and an eavesdropper. This story involves an undeveloped roll of film and equipment that malfunctions.
Remember to respect the two laws of The Storymatic:
1. Your character must change in some way by the end of the story.
2. Do not kill your main character.
Happy writing!
P.S. Remember to check out https://thestorymatic.com/ for more idea-starters.