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Humans are terrible at picking random numbers, it's quite likely many people tried the same thing (more or less).

But if the code was set by humans, it just makes finding it even more likely...

Only if somebody uses a human generated number (as done in this case). If it's genuinely random then it could take humans quite a while.

That museum is lucky to get visitors on some days.

It is only open from 1pm to 5pm, May to September, week days only.

Compare with Disneyland for footfall.

A volunteer could have had the time whilst waiting for visitors to give it a go though.

Also I would assume most people would try more than once.