FBI FAKE VIRUS SCAM HELP!?!?

I tried to download an apk on my Samsung Galaxy s7 and I got a virus/scam pretending to be the FBI. I literally can’t do anything! I’ve looked up how to fix it online and they all say to go into safe mode but I can’t even power off my device or go into safe mode at all. I can’t go home or anything. Please help!!!
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