Command key is stuck (not physically)

I tried to log into my computer today, and I found that I could not type anything in the password box whatsoever.
I then decided to log into a guest account (no password needed), and I found that I still couldn't type anything.
Messing around with pressing random keys, I discovered that the Command key is stuck, although physically it is raised and non-pressed like any other key. Typing "N" will bring up a new window, typing "T" will open a new tab, typing "F" will bring up the search screen... It is obvious that my computer is registering every keystroke as if the Command key is held down.
This effectively prevents me from typing anything whatsoever, as well as from logging into my main account.
I've already tried a restart and a NVRAM reset, both to no avail.
Any help?

17kims,
have you tried plugging in a USB keyboard, to see if it’s only your built-in keyboard that’s affected, or if it’s any keyboard that’s affected?

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