Most doors that are controlled for handicap accessability are control using a hydraulic cylinder that costs hundreds of dollars, and not a motor. Any motorized doors cost way way more than that.
I had the same thought when I was younger about putting generators attached to a bouy in the ocean, which has waves constantly and would generate power all day. Just like your door idea, it would work and would make power, but it wouldnt turn a profit. Its too expensive for the output you would get in return. So… yeah… we are gonna continue to burn fossil fuels for now cause its the cheapest… once we deplete enough of them that it gets more expensive than something else, we will switch to that until we destroy the world, or skynet takes over and we become the next power source.
Americans are hardworking too, but the American government is not actively working to support those hardworking Americans, which is the difference… the average American is working their ass off to earn less than ever to add wealth to the small percentage of ultra wealthy in power here. There are sanctions, tarriffs, and subsidies here, but the vast majority of them benefit the top of the pyramid, while leaving the majority to struggle.