A heavy door, possibly the entrance to a shed, is being unlocked. The key is inserted, rotated slowly, and then pulled out. There's an audible sigh of the door being freed from its locked state. The door is then pushed open gently, its old hinges protesting slightly against the movement. The door opens further, a grating sound accompanying the deliberate, slow push. It's a public domain sound, free of any proprietary restrictions, representing the simple yet profound act of opening a door.