I live full-time in an RV which results in very bad condensation building up in the cab and over the past year, the ignition system has gradually got more and more stiff.
At first, it was noticeable that it did not spring back from “start” to “run” (the airbag light remained on and the fan/indicators did not work) but I just had to tweak it into the right position. This was mainly an issue when starting from cold.
Then, after a long drive with the heater on, it would not turn off. It finally took a wrench to turn the key off. Leaving off the heater seemed to help this but it gradually got worse and it got more and more difficult to turn it on.
I finally replaced the key cylinder but it made absolutely no difference and now the key physically will not turn.
I am now sitting in a vehicle with no propane and full waste tanks.