Read "Sugar-Loaf Mountain" by L. Frank Baum online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
THEY examined the door carefully, and at last found near the center of it a small hole. Twinkle put the golden key into this and found that it fitted exactly. But it took all of Chubbins's strength to turn the key in the rusty lock. Yet finally it did turn, and they heard the noise of bolts shooting back, so they both took hold of the ring, and pulling hard together, managed to raise the iron door on its hinges.
All they saw was a dark tunnel, with stone steps leading down into the mountain.