If u leave the oven door open for a long time and stay near it and close all the windows and doors will u get?

In theory, that would work, but you'd have to be there for a very long time. You'd be in more danger of touching something metal, creating a static spark and blowing the place up. People have died from natural gas poisoning after a pilot light blew out, but that's usually people who are disabled or very elderly, and again, over a long period of time, like overnight.