What kind of problem? How long has the "problem" existed? Exposed nest or small entrance hole into a wall? Ground nest? Do you have pictures of the problem area?
I usually use a hand bellows loaded with 10% SEVIN dust pumped into the opening(s) at night . It usually takes only a few days for all the yellow jackets to die.
If it's inside the walls I hit it with a co contact killer so I can get close without a swarm and then dust the snot out of it. Last year I treated a garage where the entire stud bay was 1 big nest!
Paper cones are usually contact killer and then i foam the opening shut. Cut it down or scrape it off when the buzzing inside stops.