Parents I need your help! Does threatening children to throw their toys away make them clean up?

I'm babysitting my two younger cousins tonight and my older cousin (who is their mom) told me if they they refuse or won't listen to me then threaten them to throw their toys away and it will get them to keep their things and I gotta be a but "mean" to get them to learn.
I'm not TOO nice but respectful. My younger cousins are 8 and 4.

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RealMustangGuy · 61-69, MVIP

When I was a little kid (a long time ago) my mom had this large powerful vacuum cleaner. She threatened that if I didn't put away my little toy soldiers when I was done she would vacuum them up. I didn't listen, and it was not an idle threat. I watched in horror as those powerful impellers shredded my army men as they went up into the vacuum. But I never left any toys out when I was done after that.