Hi Tim,
You don't seem to acknowledge the second option in which the past participle functions
not as an element used in forming the verb tense to be used in the passive voice (transitive), but rather as an
adjective, complementing the verb "to be." In this case, whether the verbal action is transitive or intransitive becomes irrelevant.
"To close" can be transitive or intransitive. I closed my mouth. (tr,) Her mouth closed. (intr.) Even though you reason that she must have willfully done it, it's still
intransitive.
"Why is the door locked?" (reply) "I think the store closed early tonight." This is active voice, intransitive, simple past. It
doesn't imply transitive reflexive - "The store closed itself."
"It's now six o'clock. The store was closed at five o'clock." This could be passive voice. "The store was closed by person or persons unnamed at five o'clock."
It could also be an example of the verb "to be" plus an adjective complement, describing the
condition of the store at five o'clock.
"I drove past the store at quarter past five. The store was closed." Contextually, this is almost certainly an example of "to be" + adj. comp. (describes a condition)
"I drove past the store at quarter past five, and the store was being closed." This version can only be passive voice.
"When I drove by, the store had been closed." Technically, this could be interpreted either way, IMHO. However, in terms of context and common sense, it's probably passive.
Best regards, - A.
- A.