One or more pins are probably stuck.
You might try to shock the pins loose. I little judicious whacking on the inserted key or the cylinder housing might shake it loose.
Take the panel off to get good access for a proper whacking.
If you do get it loose, you may want to replace it before it jams again. It's much easier to remove while unlocked.
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1986 300E 5-Speed 240k mi.
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