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You should ask your PT too! How is your form/posture when bending down to pick up stuff?
Also I like this one for low back only: BraceUP Stabilizing Lumbar Lower Back Brace and Support Belt with Dual Adjustable Straps and Breathable Mesh Panels (L/XL) [link]
If you are on your feet daily and having lower back pain (as long as there was no trauma to the area), I would recommend physical therapy and NSAID use. I'd also recommend a back brace for additional support - [link]
This is what I've been using the past 9 months working here. It helps for me.