How to make camera rotate left or right when player moves left or right

I got it working, im gonna add some cframe lerping but other than that it works fine scorpions idea to use parts helped because that helped me figure out the rotation, but thanks everyone that responded.
if your want the code here it is:

local camera = workspace.Camera

local player = game:GetService("Players").LocalPlayer
local char = player.Character or player.CharacterAdded:wait()

local runService = game:GetService("RunService")

runService.RenderStepped:connect(function()
	local humanoid = char:FindFirstChild("Humanoid")

	if humanoid then
		local a = false
		local x,y,z = camera.CFrame:ToEulerAnglesXYZ()
		if game:GetService("UserInputService"):IsKeyDown(Enum.KeyCode.A) then
			a = true
			camera.CFrame = CFrame.new(camera.CFrame.Position) * CFrame.Angles(x,y,z) * CFrame.Angles(0,0,math.rad(2))
		end
		if game:GetService("UserInputService"):IsKeyDown(Enum.KeyCode.D) then
			a = true
			camera.CFrame = CFrame.new(camera.CFrame.Position) * CFrame.Angles(x,y,z) * CFrame.Angles(0,0,math.rad(-2))
		end
		if a == false then
			camera.CFrame = CFrame.new(camera.CFrame.Position) * CFrame.Angles(x,y,z)
		end
	end
end)
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