Through the Looking Glass Garden
Suddenly she came upon a three legged table, all made of solid glass; there was nothing on it but a tiny golden key, and Alice's first idea was that this might belong to one of the doors of the hall; but, alas! Either the locks were too large or the keys were too small, but at any rate it would not open any of them. However, on the second time around she came upon a low curtain she had not noticed before, and behind it was a little door about fifteen inches high: she tried the golden key in the lock, and to her great delight it fitted. Alice opened the door and found that it led into a small passage, not much larger than a rat-hole: she knelt down and looked along the passage into the loveliest garden you ever saw.
Alice's Adventures in Wonderland