Parked my car overnight at work, locked the doors. Come back the next day can't open the door anymore. The cylinder was sticking out a 1/4 inch and it won't rotate.

Did someone try to force the lock or is this something that happens overtime with these locks?

Is this repairable or do I need a complete new locking system?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

Never heard of this one.
I would think that the lock would show visible signs of damage if someone tried to force it.

Sounds like you need a replacement though.

Can you get the cylinder to go back in ?

Usually you need to turn the lock with a key to get it out of the door to replace it.

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250

The cylinder go's back in, but if I pull the key out it will take the cylinder out 1/4 of an inch.

Are those replacements expensive?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).