Why it worked
The video uses a common household item, the door stopper, in an unexpected and humorous way to thwart a 'crime'. The visual gag of the intruder being defeated by such a simple object creates a memorable and shareable moment.
Summary
A person dressed as an intruder attempts to break into a house by spraying a substance on the digital lock and attempting to force it open with a knife. However, a door stopper placed strategically at the bottom of the door prevents the door from opening, thwarting the intruder's efforts.