What's really hurting your low back is a stiff upper back
Grab your foam roller and learn how to create more movement in your aching back by addressing the stiffness in your mid- and upper back.
You can get foam rollers on Amazon. You need 36" long and 6" diameter. You don't need fancy, cheap will do! The brand used often by PT's is the OPTP Axis. They also have softer rollers for sensitive spines (https://smile.amazon.com/OPTP-PRO-ROL...) As a warning, the black "high density" rollers are really hard.
Our hunched sitting posture each day over many years results in mid- and upper back stiffness. This results in "overuse" of the low back (and neck!) which is one of many reasons you may hurt.
For more information about how to heal your pain, see my website: www.stephaniecarterkelley.com