There are several different kinds but the one you pick doesn't do its job. What is it?
Common Wrong Answers
“A key”
A key is actually designed to do its job of unlocking a lock; it is not an example of something that fails to perform its function.
“A door”
A door serves its purpose of providing entry or exit; it does not fit the description of something that fails to do its job.
“A switch”
A switch typically performs its function of turning something on or off, so it does not match the riddle's implication that the chosen item does not work.
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