Forks with lockouts don't really make them truly rigid. They keep the fork in a semi-static travel setting with some "play" to account for unexpected big hits done with some sort of blow off valve. I had a Manitou fork with a lockout that I left locked out and I rode a trail. Went downhill fast and hit a raised tree sapling waterbar at the bottom and heard a loud "pffft" sound. The lockout stopped working after that.
Lower end suspension forks normally don't have much in the way of adjustments. If you're commute is solely on pavement, then the sus fork is just extra weight on the front end. Convert it over to a rigid fork. Steel or carbon is recommended as aluminum can give a harsh ride.