Most of the people who read this have a key near them, that if forgotten somewhere would generate discomfort. We cannot imagine what it means to end the day and not have this key that opens the door to our home and our personal or family intimacy. This daily action is an unreachable challenge for over 941 people who sleep every night on the street of Barcelona. But the option of having a key is possible if we add an indispensable ingredient: the citizen’s will.