Let's clear up some misconceptions. WD-40, WD stands for Water Displacement, 40 stands for the 40th try. WD-40 is NOT a lubricant, use spray silicone or similar, like a suitable oil. To the OP, you could try a spray silicone based lubricant to see if this solves your problem, others wise as I previously indicated there are local suppliers for new handles, I believe I recently saw these at Lowe's when I purchased a new screen door handle.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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