The keyhole-shape appears to have been immortalized in ancient mythology, art, and esoteric symbolism across various civilizations, including Sumerian, Babylonian, and Egyptian cultures, such as the Menat symbol and Tanit symbol. See some examples in the video below.
Posted by -Joel-Snape-
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Keyhole is a prominent symbol in Alice in Wonderland also reminds me of Super Mario World when you have to locate the key somewhere in the level to enter the keyhole in order to access a secret level.
All signs point to traveling into another realm or some theme like that.