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The original was posted on /r/lifeprotips by /u/dickcheney600 on 2024-09-15 16:23:59+00:00.


They are most often found on glass doors or doors with windows next to them: usually, the reason that the previous owner (or possibly the builder) put them there is due to concerns of a burglar breaking the glass and turning the inside knob.

However, this can result in death if there’s a fire and you don’t know where the key is right then. Yes, there will be screws on the inside, but you’d still have to find a screwdriver to dismantle the lock from the inside, and that’s not something you’re going to have time for.

Belongings can be replaced.

If your concern is about a child wandering off, you can always put a latch high up on the door, out of their reach. There are also single-door alarms you can get that have a simple on and off switch on them.