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Based on kdrama, this seems common in Korea. You're 10 seconds late, you can't enter the school grounds.
Why?! How does this help? That sounds insane and pointless to the education process. Unless the point was to educate your kids to be obedient slaves with childhood trauma for their corporate overlords. We used to have something similar during communist rule in my European country, to teach kids who's boss and to respect authority.
You haven’t heard of Samsung or the life of the average South Korean student. They invest the first 20 something years of their lives to get a corporate job as soon as possible, to not be left behind. Samsungs owns like half the country.