Not locking the door of public/cafe toilets

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If there is a public toilet, say in a cafe, with a locking door but the user of the toilet does not lock the door and you open it and get a view, which you really didn't want, of them using the toilet, is the correct course of action to:

(a) Excuse yourself politely, return to the vestibule and wait for them to finish
or
(b) Grab a chair from the cafe and prop the toilet door open, so they fking learn to lock it the next time?

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Jaroon said:

Had this on a train recently. I pulled open the toilet door to be greeted with banshee screams from a middle aged woman sat on the throne. I backed away without chastising her poor door locking etiquette but on going back into the coach I recieved a few indignant looks How very dare I?

Well on trains it is often poor door design. Esp the disabled toilets with motor operated doors.

You press a button to CLOSE the door but many hapless people do not realise there is a separate button to LOCK the door. Who the fk designs two buttons for that? This leaving the door unlocked I have a lot of sympathy for.

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Nezquick said:

I don't understand people's confusion with them really. They're big, lit up buttons clearly showing what you have to do to open/close/lock the door. Only a moron couldn't work that out.

Maybe these people like being walked in on whilst dropping the kids off....who knows!

I've seen this happen several times by sensible looking people.

I think it is more likely, being sensible looking people, that it didn't occur to them that anybody could make closing a toilet door so complicated.