How to make a script to inflict harm on the wielder?

So basically, I have this sword which is 'over-corrupt' meaning it's so corrupt it hurts the person who is handling it...

I want it to hurt the player like slowly but not so slow they regenerate health or anything, just so they'll notice after around 5 seconds they're somehow getting hurt, and in this case poisoned.

I'm not sure why this won't work but can someone explain and fix it? Oh and would I need a bit to also make sure they don't regenerate health? Because I thought you can only regenerate health after a certain time of no damage, unless you have a gear - like the regeneration coil.

-- list of account names allowed to go through the door.
permission = { "MasterPoke99" } -- This is how many people can still get through, so u don't have to change shirts. You can also have another friend here. -EDIT

-- TextureId of the VIP shirt.
texture = "http://www.roblox.com" -- EDIT
function checkOkToLetIn(name) 
    for i = 1,#permission do 
        -- convert strings to all upper case, otherwise we will let in 
        -- "Username" but not "username" or "uSERNAME" 
        if (string.upper(name) == string.upper(permission[i])) then return true end 
    end 
    return false 
end 

local Door = script.Parent

function onTouched(hit) 
    print("Door Hit") 
    local human = hit.Parent:findFirstChild("Humanoid") 
    if (human ~= nil ) then 
        if human.Parent.Torso.roblox.Texture == texture then --the shirt 
            Door.Transparency = 0 
            Door.CanCollide = true 
            wait(.1) -- this is how long the door is open 
            Door.CanCollide = true 
            Door.Transparency = 0 
            -- a human has touched this door! 
            print("Human touched Poison Blade") 
            -- test the human's name against the permission list 
        elseif (checkOkToLetIn(human.Parent.Name)) then 
            print("Human passed test") 
            Door.Transparency = 0
            Door.CanCollide = true 
            wait(.1) -- this is how long the door is open
            Door.CanCollide = true 
            Door.Transparency = 0 
        else game.Workspace.Player["Left Arm"].Anchored = true
game.Workspace.Player["Right Arm"].Anchored = true
game.Workspace.Player["Left Leg"].Anchored = true
game.Workspace.Player["Right Leg"].Anchored = true
game.Workspace.Player.Head.Anchored = true
game.Workspace.Player.Torso.Anchored = true
wait(1)
game.Workspace.Player.Health:Remove()
game.Workspace.Player.Humanoid.Health = game.Workspace.Player.Humanoid.Health -0.1
wait(1)
game.Workspace.Player.Humanoid.Health = game.Workspace.Player.Humanoid.Health -0.1
wait(1)
game.Workspace.Player.Humanoid.Health = game.Workspace.Player.Humanoid.Health -0.1
wait(1)
game.Workspace.Player.Humanoid.Health = game.Workspace.Player.Humanoid.Health -0.1 -- This goes on for along time until the wielder dies...

Oh and I forgot to mention, I only want some people to be 'immune' to it's 'over-corruption'

So the script kinda also sums up what I want for it to do... Oh and where should I put it - Because at the moment it's in the handle.

Thanks... Oh and maybe change the long list into a loop? -- I don't know how :3