About the doors... Fun, but a little cheesy. SPOILER ALERT
My wife hyped me into watching this. She said it's so good the script have been bought and there will be remakes. Usually, I think remakes won't be as good, but I think there is room for improvement here, especially for Western audience. The drama, the heart to heart talks between strangers at such chaotic times felt forced and cheesy. Maybe it's cultural thing and there is stuff lost in translation?
But about the doors... I thought it was totally unbelievable that the father, who barely knew what was going on immediately ascertained that the Zombies couldn't open doors and that they attack because they see you. If I'm in that situation, I would question this guy's expertise, and not let the door go and continue to find ways to block it. But the people immediately listen to the father and let go of the door. They are safe. Then they put newspapers on the door so the zombies can't see them. That's a lot of breakthrough knowledge when movie/chaos barely started. But there is inconsistency in the writing here. The revelation that they attack because they see has been established. Yet the characters discover a similar revelation later, that they can't see in the tunnel because it's dark. They acted surprise, like they just figured it out. Well, didn't the father figured it out in the first few minutes of the chaos? That they couldn't open doors, and that they attack because they see?