Mark,
You dont want to know what you will likely have to do to get the key out...
Yep, not fun. Do a search on the forum for "ignition cylinder" or something similar. You will get lots of info on how the pull the cylinder and get the key out. Sometimes you get lucky and can do it with a simple wire tool. SOmetimes you have to cut the old lcok cylinder out, not cool. If I remember correctly, if the cylinder will go to the first position, you can use the wire tool to place into the two small holes in the key cylinder and the cylinder will come out. Do a search on this forum for the instructions, if that is the case, it will be an easy fix for you.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red