Our front door at home started making this annoying creaking noise about a month ago. I lubricated the hinges with WD-40, and it helped for a bit. Maybe the hinges are completely worn out, or is there some other way to fix it?
Silicone grease or machine oil is a longer-lasting option than WD-40. The thing is, WD-40 is basically a solvent - it evaporates quickly, especially if the hinges are outside or in a ventilated area. Try removing the door (usually you just need to pull the pins out of the hinges), clean the hinges thoroughly with a stiff brush to get rid of dirt and rust, then soak them with a thicker oil - it'll last longer. Repeat the lubrication in a month or so.
If the squeaking persists after all that, check that the door is level and the hinges are positioned correctly. If the door is even slightly warped by a couple of millimeters, it'll press on the hinges at an angle, and they'll start making noise. See if the door closes evenly without catching on the frame at the top or bottom corners. Hinges can definitely wear out over time and develop some play, but you'd usually notice that from gaps appearing.
If nothing helps and the squeaking is really annoying, it's worth removing the hinges to check whether the pins or the hinge axes themselves are bent. New hinges cost next to nothing compared to the rest of your repairs, and installation takes about 15 minutes.
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