No, spraying standard WD-40 or light petroleum oils into a sticking clothes dryer door latch is not recommended as a permanent fix. While WD-40 can provide temporary lubrication to ease a tight mechanism, it is a solvent that quickly dries out and leaves behind a sticky residue that attracts flammable lint dust and debris, eventually jamming the latch further. You can troubleshoot latch friction safely by unplugging the unit and inspecting the catch mechanism. You can verify that your corrective action is successful when cleaning the internal latch components with rubbing alcohol and applying a tiny dab of specialized high-temperature silicone grease or dry graphite powder restores smooth latching action without attracting lint.
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