[Trigger Collider Problem] My object isn't moving

I created a script who applies a constant force to the object which is inside my trigger collider. The constant force change if my trigger have a different rotation.

    private Transform obj;
    void Start(){ obj = GetComponent<Transform>(); }
    void OnTriggerEnter(Collider other){
        ConstantForce cf = other.gameObject.GetComponent<ConstantForce>();
        float rx = obj.rotation.x;
        float ry = obj.rotation.y;
        float rz = obj.rotation.z;
        if (rx==0 && ry==0 && rz==180){cf.force = new Vector3(0f,-1f,0f);} // Up
        if (rx==0 && ry==0 && rz==0){cf.force = new Vector3(0f,1f,0f);} // Down
        if (rx==90 && ry==0 && rz==0){cf.force = new Vector3(0f,0f,-1f);} // Front
        if (rx==-90 && ry==0 && rz==0){cf.force = new Vector3(0f,0f,1f);} // Back
        if (rx==0 && ry==0 && rz==-90){cf.force = new Vector3(-1f,0f,0f);} // Right
        if (rx==0 && ry==0 && rz==90){cf.force = new Vector3(1f,0f,0f);} // Left
    }

My object that is already inside the trigger does not move anymore… What’s the problem?

With this code, it does always nothing…

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class AreaGravityEffector : MonoBehaviour {
    private Transform obj;
    private float rx;
    private float ry;
    private float rz;
    void Start(){
        obj = GetComponent<Transform>();
        rx = obj.rotation.x;
        ry = obj.rotation.y;
        rz = obj.rotation.z;
    }
    void OnTriggerEnter(Collider other){
        ConstantForce cf = other.gameObject.GetComponent<ConstantForce>();
        if (rz==180){ cf.force = new Vector3(0f,-1f,0f); }    // Up
        if (rx==0 && ry==0 && rz==0)    { cf.force = new Vector3(0f,1f,0f); }    // Down
        if (rx==90)    { cf.force = new Vector3(0f,0f,-1f); }    // Front
        if (rx==-90){ cf.force = new Vector3(0f,0f,1f); }    // Back
        if (rz==-90){ cf.force = new Vector3(-1f,0f,0f); }    // Right
        if (rz==90)    { cf.force = new Vector3(1f,0f,0f); }    // Left
    }
}