Why do some people jiggle doorknobs if no one answers the door?

Flower7
I've had this happen a few times, where if someone knocked on my door a few times and I didn't answer, they would then jiggle the doorknob and try to turn it. (Luckily it was locked each time.) But what do you think people's purpose is in doing this?
Why do some people jiggle doorknobs if no one answers the door?
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