Germ key
You can find all kinds of crazy knickknacks on the internet. Many of them probably don’t have a real purpose. That’s what the OP thought when they found this metallic tool. Most assumed that it was a can opener, though we’ve never seen a can opener like this before.
It turns out that this metal thingy is actually a germ key, which you use to twist open doors without touching the doorknob. This seems like an incredibly useful tool since, you know, germs are gross and all. Did you know that brass doorknobs are antimicrobial? Yeah, the germs on the surface of brass will die without antiseptic.