First order of business is to order a new key/tumbler from the dealer so that as soon as you get the key to turn you can remove the old tumbler and pop in your new one!

How to get the key to turn is the next order of business keep trying and jiggling and moving the key eventually the tumbler pins might line up!

Or attach a handle to the key so that you can apply levered pressure in the clockwise direction that the key normally will turn, use a Popsicle stick or small screwdriver. Next get an electrical appliance that vibrates! Yeah any good vibrating appliance will work electric razor, tooth brush, a carbide tipped engraver is good, or well maybe the wife or girlfriend can think of something!?!? and a jigsaw has been known to work!

190E Ignition lock broken - Help needed

Apply slight pressure to the lever and at the same time apply vibrations to the key head, eventually the vibrating tumbler pins will all be in alignment and the key/tumbler will turn. That’s when you remove the old and pop in the new.