Image by Getty Images via Daylife With a little practice you can learn to open door knobs with your feet. Quite useful when carrying groceries or luggage etc..

It's a bit easier with a door that is opening away from you. If you have sneakers on or soles with a decent amount of friction you will be able to make one quick downward swipe against the doorknob with your foot. You should be pressing against the doorknob in the direction of the door jam, but slightly forwards so that you will be pushing the door open once the latch disengages. I find it takes about 2-3 inches of dragging along the sole of your shoe.