Labyrinth (1986)

Young Sarah is left home alone by her parents and she has to babysit her little brother Toby. But the baby keeps crying and Sarah, while telling him a story to make him sleep, inadvertently conjures from a fantasy world the Goblin King who steals the child and brings him to his castle in the middle of a labyrinth. Sarah has to rescue him before midnight, or the baby will became a goblin…