How to rotate a gui? (Effects)

I am trying to make a gui wobble back and fourth between 5 and -5 then restart the process from the opposite side back. I am mainly trying to do this in a convenient way that also makes the gui rotate smoothly.

Code:

local frame = script.Parent.Frame


while true do
for i = -5,5,.1 do 
wait()
frame.Rotation = i 
for i = 5,-5,.1 do 
wait()
frame.Rotation = i 
end
end 
end 

Thanks in advanced. I also want to try and stick to coding this in a more compact way other than listing every single rotated value wait waits in between.

Just move the ends around

Wait for the first for loop to end before starting the next.

local frame = script.Parent:WaitForChild("Frame")

while true do
	for i = -5,5,.1 do 
		frame.Rotation = i 
		wait()
	end
	for i = 5,-5,-.1 do 
		frame.Rotation = i 
		wait()
	end 
end 

I also used a negative 0.1 on line 8 so that it counts down, and I used WaitForChild on line 1 to define Frame.

Good Luck!

If I helped, please don't forget to accept my answer.