Erm, maybe the locks in germany(europe) are different - but what you describe I only know from very old or cheap locks, no one would use for a front door (insurance would not accept that).
haha, well in America, insurance has no idea what kind of locks you have, and the vast majority of home locks are "whatever was cheap at home depot".
My front door is a pricey digital lock with a key for backup, and I don't think I could pick it with this method. That's why my first instinct was to try on our cheapest door.
Which is always hilarious to me considering insurance has no problem with glass windows or fenced in backyards.