My Little Pony - Twinkle-Eyed Locket (1986)

"Could you hold these keys for me, Locket?" Milky Way asked with a secret smile, handing three keys to her curious friend. "I wonder what they open," Locket thought to herself. After trying the keys in every door without any luck, she spotted Milky Way's magic jewelry box on the dresser. Excitedly, she inserted the first key into the lock. It opened! She raised the lid and found a smaller box inside. Her eyes were twinkling wildly as she opened the smaller box with the second key. Inside was a golden locket that glowed as bright as the sun! When she put the last key into the locket the room filled with shooting stars and colorful rainbow arches! "I see you opened my magic locket," Milky Way said peeking into the room. The two friends laughed and hopped on a shooting star for a whirling ride around the sky!