You can try getting a screen session, described here. You may want to try disconnecting the wifi nub to try this? If you are able to get the terminal to respond this way then you can try some things like systemctl restart norns-matron.service to restart the Lua environment / menu interface, or just sudo shutdown now to do a clean power off.
This happened while entering the wifi password? That would seem to maybe rule out a large shift in system time as the culprit here (this has caused issues in the past), since norns would not have had an internet connection with which to contact a time server yet.