Important part there being WITNESS. If they have a warrant for the item in question you most certainly DO have to give it to them. And if they have a warrant that says you have to unlock it (say the item in question is a tamper proof safe) then you have to open it. That’s where a lot these cellphone cases hang, because many of them will wipe the data if you fail login too many times they have a reasonable expectation that evidence could be destroyed if they tried to unlock it themselves you get to open it for them.
The courts are split on the matter. Some say you can be compelled to provide a pass code, others say not. I would refuse.