Repeat A: I can't unlock the door! B: Maybe it's because the key is brand new. A: The lock won't turn at all! B: Are you sure the key is not upside down? A: I've flipped it five times! B: It still doesn't work? A: No! The door is still locked. B: Let me try to open it. A: Maybe you'll have better luck. B: I see what the problem is. You're using your old key! A: Oops! I'm so used to my old house. B: It's alright; eventually you'll get used to this one.