How to set up orbit and camera values to move like a human walking

Question

I have a scene with an object and I want to move like a human walking inside my scene, that means: minPolarAngle and maxPolarAngle stay "locked" and stop my movemente when I reach camera.lookAt position

I put the same value in minPolarAngle and maxPolarAngle but when I reach the camera.lookAt position value the orbit changes rotation like climbing a hill. It makes any sense?

As I said before, I just need a "walking" feeling but do not how to set up orbit and camera values.