The Wizard of Oz by Lynam Frank Baum Chapter 10 Page 15

Then the green man fitted spectacles for the Scarecrow and the Tin Woodman and the Lion, and even on little Toto; and all were locked fast with the key.

Then the Guardian of the Gates put on his own glasses and told them he was ready to show them to the Palace.

Taking a big golden key from a peg on the wall, he opened another gate, and they all followed him through the portal into the streets of the Emerald City.