I was always interested in how things work-stripping down old engines etc and this is a clean alternative. Why do we do it? It's a bit like explaining the pleasure of fishing to a non-angler-either you completely get it or you're mystified.
When I bought my house it had a lovely Victorian stained glass door which we were determined to keep so had it dipped and restored.
When the door was finished and fitted a pal came to look and immediately told me to replace the old Yale type lock. When I enquired why he showed me a technique called 'bumping' where you place ANY key that fits into the lock, keeping gentle pressure on the key in the direction to open whilst gently tapping the end with a hammer or similar the lock opens. Needless to say the lock was replaced that day.
Don't get too worried about "bumping"-it's not as simple as it sounds-if interested in locks,can I recommend taking a look at "bosnian bill" on u tube-all will be revealed!
Apparently, some tea-leafs just grab the Eurolock with a pair of pliers and snap them off, then turn the inside with a screwdriver.
ABS locks have a short section that snaps off, leaving the rest of the lock still working and too far in to be reached by pliers.