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F30 means that your oven sensor has shorted. This happens during self clean sometimes. You'll need to pull the oven out and remove the back sheet metal panel. You can unplug the oven sensor and plug a new sensor in and that will unlock the door. You would need the model number to get the correct oven sensor however so that could be difficult to get.
It's not easy to manually unlock the door. You'll need to use a coat hanger and pull the latch assembly from RIGHT to LEFT by slipping it down between the door and the oven frame at the top. Force the latch over to the left and open the door, then you can get the model number. Now I do want to also add that you may need something stronger than a coat hanger to manually open the door. If you have an "L-shaped" tool like a cotter pin puller or allen wrench, that might give you the added strength to be able to pull on the latch and release it.
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?