-- LocalScript placed in a Tool or Part

local UserInputService = game:GetService("UserInputService")
local Players = game:GetService("Players")
local Workspace = game:GetService("Workspace")
local mouse = game.Players.LocalPlayer:GetMouse()

local isLocked = false
local lockedPlayer = nil

local function findClosestPlayer()
    local closestPlayer = nil
    local shortestDistance = math.huge
    local mousePosition = mouse.Hit.p

    for _, player in ipairs(game.Players:GetPlayers()) do
        local character = player.Character
        if character and character:FindFirstChild("HumanoidRootPart") then
            local distance = (character.HumanoidRootPart.Position - mousePosition).magnitude
            if distance < shortestDistance then
                shortestDistance = distance
                closestPlayer = player
            end
        end
    end

    return closestPlayer
end

UserInputService.InputBegan:Connect(function(input, isProcessed)
    if isProcessed then return end
    if input.KeyCode == Enum.KeyCode.E then
        isLocked = not isLocked

        if isLocked then
            lockedPlayer = findClosestPlayer()
            if lockedPlayer then
                print("Locked onto:", lockedPlayer.Name)
            end
        else
            print("Lock released")
            lockedPlayer = nil
        end
    end
end)

game:GetService("RunService").Heartbeat:Connect(function()
    if isLocked and lockedPlayer then
        -- Example: You might want to update the tool's position to follow lockedPlayer
        -- Replace this with your desired behavior (e.g., aiming the tool towards the lockedPlayer)
        -- For demonstration purposes, let's just print the distance.
        local distance = (lockedPlayer.Character.HumanoidRootPart.Position - game.Players.LocalPlayer.Character.HumanoidRootPart.Position).magnitude
        print("Distance to locked player:", distance)
    end
end)