Winter “automatic” run

Hey. Recently i was thinking about what if theres nobody home, im in work and there is winter. I couldnt let chickens out at 6 am but probably at 11am or 12pm, but i’d be at work. So i came up win the idea of a smaller but not too small caged run near the coop. There would be these small doors for chickens but with an additional curtain thingy so chickens could get out and in but the cold air couldnt. I’d just open the small doors hatch and go to work and chickens would get in and out when they like. Would it work? Or are there any better ideas?