Halloween Party House

This year, you and your friends have decided to celebrate Halloween. You rented a house outside the city fearful and decorate it with different festive paraphernalia. You had fun, but you got sick, you went to another room to rest. You fall asleep and when awake, they saw that all had gone home, and the house was closed with a key. You remembered that somewhere inside there is another key. Find this key in order to return home.