Why did old roller skates have a key?

what was the key for? I remember this cute song that goes "i got a brand new pair of roller skates, you have a brand new key". I also read in an obituary "he taught his younger sister to roller skate then stole her skate key". Was the key somehow neccesary to take off the skates or something?... show more what was the key for? I remember this cute song that goes "i got a brand new pair of roller skates, you have a brand new key". I also read in an obituary "he taught his younger sister to roller skate then stole her skate key". Was the key somehow neccesary to take off the skates or something? Enlighten me about this please. Why would a skate need a key? what was its function?
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