LOC is a control panel lock not a door lock, see below.
The Control Lock shuts down the control panel pads to prevent
unintended use of the ovens.
When the control is locked, only the CLOCK, TIMER SET and
TIMER OFF pads will function.
The Control Lock is preset unlocked, but can be locked.
To Lock/Unlock Control: Before locking, make sure the ovens,
Timer and Timed Cooking are off. Press and hold START/ENTER
until a single tone sounds and “Loc,” a picture of a lock and
“START?” will appear on the oven display, about 5 seconds.
Repeat to unlock and remove “Loc” from display.
If the above does not work have you tried removing power from the uit for a few minutes to see if it will reset.