If you are used to driving a manual, you don’t rest your foot on the foot rest area, you keep it just about to push the clutch. Also, saying the brake pedal is the full width of two pedals is wrong, but it is certainly wider. I have gone for the clutch in an automatic once and just barely caught the edge of the brake pedal. The results were very confusing, and without exaggerating it took me 5-10 seconds to figure out what I had done. It was while driving my mom’s car with her in it and she looked at me with the most “what the fuck are you doing?” look she has ever made.
This was all over twenty years ago but yes, it is definitely possible.