In my experience you are better off removing the lock that is giving you trouble and spraying loads of cleaning fluid (such as brake cleaner) through it and then doing the same with a pressurised lubricant (not WD 40). I've found there to be loads of swarf in the lock that causes the trouble. Once removed - with luck - the lock will work for a little longer.

If you still have the original keys the dealership is (well was) able to get a replacement lock if you want.

Changing a whole lock set is a bit of pain - but when needs must...

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!