For months, my left capital shift key on my favorite keyboard worked poorly. To get a few words in capitals, rather than use Shift Lock, I would hold down Capital Shift with my left little finger. Only partial and erratic capitalization resulted, even if I pressed firmly.
Chat GPT suggested thoroughly spraying with a pressurized computer air can. This seems to have helped a lot. See illustration. Ten or fifteen seconds from every angle. If possible, have a second person tap the key while you spray the heck out of it.
Chat GPT did NOT recommend attempting to take off, clean, and replace the key on my model keypad.
