The idea of the locking column and tucking the switch into the dash is to make the car more theft resistant.
There are one way screws that hold the lock assembly together and you need to get the plastic cover off first to gain access to it.
Having had the steering column out several times I would advise that the simplest and most expedient way to deal with this is to remove the entire steering column from the car and put it on the workbench where you can work on it in a humane way to your own body.
It may be that the mechanism itself just needs to be lubricated.
The wiring from the switch can be disconnect from the junction block with a screw driver.
Once the four nuts that hold the clamps to the dash assembly are removed, the column will just pull out of the D shaped drive socket of the rack assembly.