编写一篇随机生成的小故事，包含人物、地点和情节。


人物：Anna、Tom、Susan
地点：加油站
情节：被困在加油站
Anna, Tom and Susan were on a road trip and their car broke down at a gas station in the middle of nowhere. They tried calling for help, but there was no cell phone signal. As they waited for someone to pass by, they noticed strange noises coming from the gas station convenience store. Suddenly, the door slammed shut and they were trapped inside. They soon realized they were not alone and something sinister was lurking in the shadows...