How to remove a broken key from the lock. The disk lock, the Finnish key semi round profile

What to do if the key broke and remained in the lock? How to get a piece of the key from the keyhole?
This method is suitable for the Finnish keys (DiscCopy, semicircular). Such keys are used in the disk locks.
Make sure that broken bit move freely and the internal lock mechanism does not interfere with its output. Stick to the key strip of double-sided adhesive tape as shown in the video, insert the key into the lock until it stops and pull. If you do not manage to remove the chip, you can try again. In General, it is enough to pull him closer and we can extract a thin tool.
You can use regular Scotch tape, sticky side out.
Remove part of the key, I tried thin and sharp tools with rounded ends, used glue and magnet, but nothing helped.

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