I came across this video the other day on YouTube whilst actually sitting in my hotel room.
I did check it out and found that my hotel had a very different make of safe to the one shown in the video. I have however seen the shown model in hotels I have stayed in, but in the UK at least they are quite rare.
So the safe in my hotel room could not be opened by an all zero code but that does not say their isn’t a master code known by all the staff.
In any case however it is clearly a potential problem and one any traveller should be aware of. I did post the video on Facebook and a friend did come back and suggest one of these.
So be careful out there people.