How to check if a key is being held down?

You can use the :IsKeyDown() method of UserInputService. Just pass the key you want and :IsKeyDown() will return true if the key is being held down, false otherwise.

local UserInputService = game:GetService("UserInputService")

UserInputService.InputBegan:Connect(function(input, gpe)
    if gpe then return end

    if input.UserInputType == Enum.UserInputType.MouseButton2 then -- you can detect mouse input
        if UserInputService:IsKeyDown(Enum.KeyCode.E) then
            -- Code
        end
    end
end)

Hopefully this answered your question, and if it did, then don't forget to hit that "Accept Answer" button, and optionally, give an upvote. It helps out a lot. If you have any other questions, then feel free to leave them down in the comments.

First, insert a LocalScript into the StarterPlayerScripts in the StarterPlayer. Remove the print function and replace it with this:

local UserInput = game:GetService("UserInputService") -- So we can fire the function below

local function inputR(inputObject, gameProcessedEvent)

end

UserInput.InputBegan:Connect(inputR)

Now insert a simple if statement inside the local function with a return.

local UserInput = game:GetService("UserInputService") -- So we can fire the function below

local function inputR(inputObject, gameProcessedEvent)
    if gameProcessedEvent then return end -- I did it this way so it doesn't take up space.
end

UserInput.InputBegan:Connect(inputR)

Now make sure the user has a keyboard, so no weird errors occur.

local UserInput = game:GetService("UserInputService") -- So we can fire the function below

local function inputR(inputObject, gameProcessedEvent)
    if gameProcessedEvent then return end
    if inputObject.UserInputType == Enum.UserInputType.Keyboard then

    end
end

UserInput.InputBegan:Connect(inputR)

Now test the key you would like to be pressed. I Added more comments to make more clear.

local UserInput = game:GetService("UserInputService") -- So we can fire the function below

local function inputR(inputObject, gameProcessedEvent)
    if gameProcessedEvent then return end
    if inputObject.UserInputType == Enum.UserInputType.Keyboard then -- So we know that the player is holding down a key on their keyboard instead of a fake one
        if inputObject.KeyCode == Enum.KeyCode.R then -- Replace "KeyCode.R" with any other key, for example, left shift is "Enum.KeyCode.LeftShift". --
            --Do code for your key pressed here
        end
    end
end

UserInput.InputBegan:Connect(inputR) -- So we can fire the function when any key/mouse is pressed. Anything else will also fire the function, like gamepad.

I hope this was helpful!