probably the ignition switch. my car did the exact same thing and it was the clicky thing in the switch that was stuck (do not know the technical term for it). I pushed the key back into the ignition turned it on, turned it off and pulled the key back out and the locks worked fine after that. The key cylinder thinks your key is in the ignition, so that is why the car is not locking.
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Lov'n my boxster!
2013 Lexus IS350awd
2007 Toyota FJ Cruiser
2004 Porsche Boxster S
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