How can I make a gui animation trigger when a certain key is pressed?

This is the one I tried making but didnt work can anybody help me find a tutorial or even help me themselves?

local Frame = script.Parent.Frame
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local Box = Frame.Box
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local Button = Frame.Button
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Player = script.Parent.Parent
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mouse = Player:GetMouse()
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local Animate = function(Frame, EndPos, EndSize, Direction, Style, Time, OR, Type) -- Frame, UDim2, easingDirection, easingStyle, float [time], bool [override], TypeOfAnimation
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    if Type == "Position" then
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        return Frame:TweenPosition(EndPos, Direction, Style, Time, OR)
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    elseif Type == "Size" then
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        return Frame:TweenSize(EndSize, Direction, Style, Time, OR)
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    elseif Type == "SizeAndPosition" then
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        return Frame:TweenSizeAndPosition(EndPos, EndSize, Direction, Style, Time, OR)
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    end
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end
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function onKeyDown(key)
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    key = key:lower()
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if script.Parent.Open.Value == false then
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    if key == "e" then
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Box.Position = UDim2.new(-2,0,0,0)
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Animate(Box,UDim2.new(0.150,0,0,0), UDim2.new(0.25, 0, 0.25, 0), "Out", "Back", 2, true, "Position")
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        end
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    end
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end
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mouse.KeyDown:connect(onKeydown)