two keypress activates ability, how to disable keypress/activation after?

[Webbing]

Code:

cool = 0
hook.Add("KeyPress", "speedability", function(ply, key)
    if key != IN_USE and !ply:KeyDown(IN_SPEED) then return end

    if key == IN_USE and ply:KeyDown(IN_SPEED) and ply:Team() == TEAM_LS and cool == 0 then

        timer.Simple(0.1, function()
        ply:SetWalkSpeed(640)
        ply:SetRunSpeed(960)
        cool = 1 end) end

        if cool == 1 then

        timer.Create("resetAbility"..ply:EntIndex(), 8, 1, function()

            ply:SetWalkSpeed(160)
            ply:SetRunSpeed(240)
            cool = 0
            end) end

end)

I know this isn't correct but I'm having a brainfart - how do I stop the function from running if the player presses Shift+E again - so that they can't infinitely trigger the speed ability?

[Lapin]

hook.Remove("KeyPress", "speedability") after triggering it ?

[Webbing]

I believe I've already tried this and ply returned nil by DarkRP, so I switched to setting the state of "cool" instead but because the whole thing is called every keypress (the and cool == 0 statement seems to have no effect) I'm assuming it's overriding the check?

I was under the impression that the state of "cool" would do the same thing as storing the variable in the player entity (behavior wise).