I'm not sure of the correct use of "was" or "were in the following sentence:

I checked the doors and neither of them (were or was) locked.
'neither of them' means not one of them. It is invariably singular: was.
Senior Member2,552
neither one was.
Senior Member3,149
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were locked... was is singular and were is plural.

I checked the door and it was locked.
I checked the doors and they were locked.