Magic force field ? Or some gaz or magic that disable, give pain or kill when aproaching or entering it, without anybody knowing particularly that "a gaz" is the problem; just that whoever enters get sicks as hell and cannot move anymore
(If want to have a reason why nobody never entered, but your players needs to be able to enter)
Smoke and mirrors. Optical illusions. Puzzles. Riddles. Trap doors. Hidden sharp objects. Hidden blunt objects. Needing multiple people to complete something or turning multiple keys or keylike objects from other parts of the story perhaps?
The room is filled with a deadly gas. Either it is built so that it vents into the room naturally from deep under ground, or a diffuser is periodically refilled by whoever controls access to the room.
The McGuffin is the antidote to the gas, which you must obtain and administer before entering.
One way of getting a very localised danger like this would be to put it near radioactive ore deposits? You can only go in with a lead shield, and have to angle it correctly
You can spread powder on the floor so you could see if someone had stepped in. It wouldn't keep them out unless they didn't want anyone to know they'd been in there.
I guess it depends. The easiest thing would be making it inconvenient to get in the room for no perceived reward. Maybe it's a known room but everyone thinks it's empty/unimportant and it's blocked by an obstacle (boulder, waterlogged door, etc).
If you're going to introduce higher technology or magic, then a lock would make the most sense. Maybe it's opened by someone or it could even be a time or situational lock.
If there's high incentive to get into the room, then there's a couple options. You could make people believe they already accessed the room when the real room is hidden. It could be impossible to enter - no door, difficult material, catastrophic event that moved/blocked it, or even everyone knew of the room but doesn't know where it is now. You could make social deterrents. Maybe there's a superstition around the room, a religious indictment, security personnel, etc.
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