Just to confirm, because I fear the game show has a loophole, what is preventing you from eyeballing the key when he picks it, memorizing the notches, then you have a much better chance of getting the correct one. Prisoners have been known to memorize notches on a key in order to build duplicates and break out of jail.
The correct key wasn't put on full display, and the kids didn't really get much time to look over each key to pick the right one. He may have been able to determine the head shape in that time, but not much else.
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Just to confirm, because I fear the game show has a loophole, what is preventing you from eyeballing the key when he picks it, memorizing the notches, then you have a much better chance of getting the correct one. Prisoners have been known to memorize notches on a key in order to build duplicates and break out of jail.
The correct key wasn't put on full display, and the kids didn't really get much time to look over each key to pick the right one. He may have been able to determine the head shape in that time, but not much else.