Those things are too easy to open with a bump key. For the last 15 years I've insisted on proper secure locks and keys. The most I've ever had to pay to retrofi

Those things are too easy to open with a bump key. For the last 15 years I've insisted on proper secure locks and keys. The most I've ever had to pay to retrofit one is €90, and I got 5 keys with that lock. In my current house, front and back doors were replaced. My neighbour replaced his too when I demonstrated a bump key to him. Having a symmetrical key isn't something that I even care about but I suppose it's a bonus.