I also use a Black and Decker Classic iron.. I've had it a number of years and it's still going strong.. I hate, make that HATE, auto shut off.. My B&D doesn't have one..
To make sure I don't leave it on, I have it plugged into a power strip that also has the clip on light that spots my ironing surface plugged into it.. so when I leave the basement, I just make sure no lights are on.. and that way nothing is left on.. no lights, no iron, no machines. It works great for me.