Airsound,
Perhaps I can help.
If the lift fan door jams shut, then the only option is a normal landing to a runway. At sea, with a STOVL ship, it's going to be divert ashore or take the ejection seat. This would apply to other doors in the STOVL lift system as well.
Of course, it's always a risk when you design bits of aircraft that need to be covered up by panels that can stick shut. Like landing gear, cockpits, bomb bays.....look, this isn't an all new issue.
Designers and engineers work damn hard to make these mechanisms as reliable as possible, and then some. And ensuring that they don't rip off in flight. They spend hours (and dollars) doing all that in the background so that they are (as far as practicable) not a problem in service.
Yes, the F-35B lift fan door was a very big challenge. What I can say with some certainty is that the solution was in large part due to the efforts of a number of very talented Brits working with LM. As was the whole world-beating lift system.
Best regards as ever to all those really clever people,
Engines