How can I know if a player is in a room?

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8

You can use ZonePlus:

ZonePlus

local Zone = require(game:GetService("ReplicatedStorage").Zone)
local container = workspace.SafeZoneContainer
local zone = Zone.new(container)

zone.playerEntered:Connect(function(player)
    print(("%s entered the zone!"):format(player.Name))
end)

zone.playerExited:Connect(function(player)
    print(("%s exited the zone!"):format(player.Name))
end)