Subaru Problems? Ask a Mechanic for Answers ASAP
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If the ignition is not turning all the way off to remove the key this can be due to the shifter not all the way in park with an auto transmission or the shifter position switch failing telling the computer it isn't in park when it actually is.I have also seen issues with the electronic ignition switch itself at fault needing replaced to correct issues like this here.
If the key is all the way off but the key will not come out most likely the ignition cylinder is coming apart internally causing this fault here and needs either replaced or in some cases a small amount of lubricant can be sprayed past the key into the cylinder to work the key loose from there.
This will have to be checked into further to see which component is causing this here then repaired from there.