I’m half-expecting a Therac-25 situation in those edge-case operating moments, but then remember that microwave ovens, unlike the Therac-25, have physical interlocks to prevent open-door operation.
You really don't want to succeed in faking it out, though. Not because it'll microwave you, but because part of the safety mechanism is a fuse that blows if the door is open while the magnetron is on.
I remember having some microwave oven that started rotating if I opened the door partially at just the right angle. Hopefully does not mean the magnetron was actually running.