Essentially a quite dry 15 minute monologue describing the curious tale of a young lady who, as habit always locks the doors of rooms she’s staying in, and the terrifying night that she forgot.

Is this atmospheric? Absolutely. Will this terrify modern audiences? I’ve had more scary bathroom visits.

I struggle to imagine this scaring people even at the time, especially considering this came out in 1949. Maybe 10 years earlier it would have more effect. But as it stands, it’s a story told quite well. In an atmospheric tone…but that’s about it. I was hoping the resolution was a little more unsettling…but it plays more as a cautionary tale than a short, sharp shock.

source https://letterboxd.com/tytdreviews/film/lock-your-door/