Why can’t things be sterilized by time?

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I have a pair of scissors that’s been in a mostly unopened cabinet for 5+ years. I wanted to cut open a bag of breastmilk with clean scissors but water and soap aren’t readily accessible at the moment.
The cabinet is in a former classroom so presumably the scissors were used by kids. My husband says using the scissors wouldn’t be sanitary. I believe him, but honestly I don’t understand why with time and no food the bacteria wouldn’t just die.

EDIT: I should have used the term sanitary not sterile. My baby is old enough that we don’t sanitize pump and bottle parts daily, just wash and dry after uses.

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