How do i change a blocks value only for one player?

Scripting helpers isnt a request site.You have to try the code your self and as for help this is scripting helpers not scripting givers.Dude just visit this link for more information of how to post a good post.

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There is a CanCollide property in Parts that can be triggered through Script. Here is an example of a Team door script that uses this:

Door = script.Parent
function onTouch()
    if Door:FindFirstChild("Humanoid") ~= nil then
        player = game.Players:GetPlayerFromCharacter(Door)
        if player.TeamColor = BrickColor.new("Bright blue") then
            Door.CanCollide = false
            Door.Transparency = 0.5
            wait(2)
            Door.CanCollide = true
            Door.Transparency = 0
        end
    end
end
Door.Touched:Connect(onTouch)

And, don't listen to Daniel. To be honest, he is an idiot. He obviously didn't bother to read and understand the guidelines (not kidding, Daniel).

I think you can only do this with FilteringEnabled on.

(ADD THIS TO STARTERPACK OR STARTERCHARACTERSCRIPTS)

In a local script:

--MAKE SURE FILTERINGENABLED IS ON (check it on workspace properties)
--No need for RemoteFunctions, since this is for the Local Player only

wait(1) -- waits for the player to load in

local Player = game.Players:WaitForChild(game.Players.LocalPlayer.Name)
local Character = Player.Character

local BlockName = "Door" -- change this to the name of the block you want the player to be able to walk through
local Time = 1 -- how long the door will remain open(in seconds)

Character.Torso.Touched:connect(function(hit)
    if hit.Name == BlockName and hit.CanCollide == true then 
        print("" .. Player.Name .. " has touched" .. BlockName .. "!")
        hit.CanCollide = false 
        hit.Transparency = 0.5
        wait(Time)
        hit.CanCollide = true 
        hit.Transparency = 0
    end
end)