We were screwing around with "Find my phone" and locked my work computer over the long weekend. I come in to the office, see the "Enter your pin" prompt, and am unable to enter the pin. The keypresses aren't being sent to the imac. Have tried with different keyboards (wired USB), changed batteries, without any luck. This computer isn't stolen, I know all of the required passwords. Is this something for a Genius Bar to fix?