I own a Frigidaire gas oven model #FGFS68CJSA beside an F3 error code and locked door.? I turned the breaker switch and unplugged it but still beeps...

I turned the breaker switch and unplugged it but still beeps and is locked. Is within a way to clear the oven door on this model from the outside and silence the beeps?
How to buy a interior nouns condenser?
Answers:    The oven warmth sensor is open. See http://www.repairclinic.com/0088_13_1.as...
for more suggestion and to buy the part but for locally available.