Root access in ADB shell

Hey guys I am struggling pretty hard right now. Currently my phone is locked out, I can't get past the lock screen.. something happened to the code I use, not sure. Anyway, I've read up online and people are saying that I could "rm *.key" and that should give me back access to my phone. So I'm in ADB shell trying to rm *.key but I can't get permission. My phone is previously rooted, and when I type su my phone light sup but because I can't get past the lockscreen I can't grant access.

Any suggestions on what I can do?

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