As a stopgap, you could stick one of those self-adhesive rubber feet that come with some electronic items on the inside of the door where the plunger hits. That should be enough to turn off the light.
I can't think of any non-destructive way to un-warp the door. Luckily, mine is fairly straight.
The Datsun 240Z lettering on mine is not chrome, but more of a matte finish silver. I suspect that has faded or worn off of yours.
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