A friend of mine tried to convince me that the expression "the doors is closing" is correct. It sounds completely wrong to me, but googling for it turns up some results.
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In most contexts it would be ungrammatical in Standard English. However, it might properly occur if ‘The Doors’ was the name of a play that was coming to the end of its run.
This is basic grammar.
Door (singular) + is.
Doors (plural) + are.
The only time you could consider using doors with a singular verb would be if you were referring to the band The Doors:
(Although some would say "The Doors were a band....")