I have a fruit tree that provides a LOT of fruit. Half of it hangs over a fence. I don't mind if people come up and take some of the "low hanging fruit". How

I have a fruit tree that provides a LOT of fruit. Half of it hangs over a fence. I don't mind if people come up and take some of the "low hanging fruit". However the other day I caught a lady halfway across the top of my fence, her torso was in my yard. This is a 6 foot tall fence. The problem is that if you give an inch, people take a mile.