if the key won't turn back it is because the shifter button is sticking. most common problem for this is coffee or soda being spilled on center console. usually to fix this remove the shifter handle then remove the trim over it. just be careful not to lose the retaining clips. and then spray the shifter mechanism with brake cleaner its just alcahol so it won't melt the plastic make sure you get it down the shifter stalk also and then lube it with crc or wd40.
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