how do you farm when you play vs a lane bully?

this always happens either when playing vs a ranged champion or someone like darius or renekton, where im atleast 30 cs behind, cant walk up to farm cause ill die, cant even farm under tower cause they keep harassing. How is one supposed to play in that situation? and dont say "call your jungle for help" since most jungles only come when you already win the lane
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