Understairs (Harry Potter fanfic)

Under the stairs is a locked cupboard in the house Alisha rents, that she passes every day on the way to what turned out to be a nine-to-five kind of job. One day, she finds it unlocked only for the door to close and lock behind her, the light going out. What happens next is not what she expected, but then what would she have otherwise ended up in through a cupboard under the stairs? Disclaimer - I don't own Harry Potter. This is written for Open Novella Contest's prompt number fifty-seven. "For as long as you've rented the house, the door to the cupboard under the stairs has always been locked and you never paid it any mind. You wake one morning, and discover that not only is it unlocked, but wide open."