How to make a brick that makes you slower when you touch it?

@Above. He wants the walkspeed to go back to normal after a short amount of time..

script.Parent.Touched:connect(function(p)
    local human=p.Parent:findFirstChild("Humanoid")
    if human.className=="Humanoid" then
        if human.WalkSpeed>10 then
            human.WalkSpeed=10
            wait(8)
            pcall(function() --Dirty hax to prevent breaking if humanoid is nil.
                human.WalkSpeed=16
            end)
        end 
    end
end)

script.Parent.Touched:connect(function(hit)
    if hit.Parent:findFirstChild("Humanoid") then
        hit.Parent.Humanoid.WalkSpeed = 10
    end
end)

It's hot hard at all. You need to use the OnTouched function. Try this:

function onTouched(hit)
hit.Parent.Humanoid.WalkSpeed = hit.Parent.Humanoid.WalkSpeed-5
end
script.Parent.Touched:connect(onTouched)

Note that you can change the 'hit.Parent.Humanoid-5' for a simple number, or replace the 5 by any other number. In the case you want the speed to come back to normal, add these two lines between hit.parent and end.

wait(5) --change time to whatever
hit.Parent.Humanoid.WalkSpeed = 16

Hope this helps.

Edit - Found a mistake in my script. Oops.

script.Parent.Touch:connect(function(c)
if c~=0 then
i=game:service("Players"):GetPlayerFromCharacter(c)
c.Character:FindFirstChild("Humanoid").WalkSpeed=c.Character:FindFirstChild("Humanoid").WalkSpeed-4
end end)

To do this the best way would be with the Touched event :

This code would be put in the brick that you want to slow down players

newspeed = 10 -- What the new walk speed will be
effecttime = 5 -- How long the slow down effect lasts

script.Parent.Touched:connect(function(hit) -- This function will fire when a part hits the brick
    if hit == nil or hit.Parent == nil or hit.Parent:FindFirstChild("Humanoid") == nil then return end -- Checks to make sure that the part that hit it didn't get removed, has a parent and has a Humanoid in it
    hum = script.Parent:FindFirstChild("Humanoid") -- Get the players humanoid
    speed = hum.WalkSpeed  -- Get the players WalkSpeed
    for i = 0,1,0.05 do
        hum.WalkSpeed = Vector3.new(hum.WalkSpeed,0,0):Lerp(Vector3.new(newspeed,0,0),i).x -- Fancy function to slowly apply the slowness effect
        wait()
    end
    wait(effecttime)
    for i = 0,1,0.05 do
        hum.WalkSpeed = Vector3.new(newspeed,0,0):Lerp(Vector3.new(speed,0,0),i).x -- Fancy function to slowly remove the slowness effect 
        wait()
    end
end)

I tried to explain as much of the code as I can but you can remove it

If you have any questions, concerns or just need some help with this PM me on ROBLOX!