I am making a game that has different walkspeeds in different sections, but I don't want people to change their own walkspeed with hacks. My solution was to make a part and stretch it to fit the entire area and make it invisible + CanCollide disabled, and then use the child script to kill you if your walkspeed isn't what it should be:

script.Parent.Touched:connect(function(WSChecker)
    if not WSChecker.Parent then return end

    local humanoid = WSChecker.Parent:FindFirstChild("Humanoid")
    if not humanoid then return end

    if (humanoid.WalkSpeed ~= 25) then
        humanoid.Health = 0
    end
end)

Problem is that it does not work with multiple players in the part at one time, and I want to make it so it will kick the player instead of killing them. Is there a way to go about these problems? It has to check their ws only within the part, and I don't know how to make it kick whoever changed their ws instead of killing them.