ivy growing between sliding glass door frame
Having a picture would be good. If ivy is growing there, it means it is getting water somehow, which is bad. Just cutting the visible part will not fix the critical problem, which is the water supply.

When ivy grows it creates a thick mat of small roots and veins that make sort of a carpet in the floor of the area. This mat has to receive water for the ivy to grow. You need to find the root mat the ivy is growing out of, and remove it. Then you need to clean away the dirt there. Also, you need to figure out how it was getting water in the first place and change the drainage around your house so that water is not being fed to that area.