Squeaking hinges and a lock that’s hard to turn can both usually be solved by a spray of aerosol lubricant, such as WD40. The lubricant should be applied onto the latch mechanism or on to the hinge pins.
After you’ve sprayed the hinges, open and close the door a few times to encourage the lubricant to flow through them. Wipe away any excess to prevent this from dripping onto the floor.
Try to oil your locks and hinges every six months or so, to prevent them from seizing up or sticking.
