Mathf.Clamp does not work correctly in trannsform.position I'm trying to create a 2.5D game but I'm having trouble limiting camera movement

 *using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class cam_man : MonoBehaviour {
     public Transform player;
     public float speed;
     public Transform ini;
     public Transform fim;
     public float temposuave;
     public float speedfim;
     public Vector3 speedfim3d;
     
 
 
     // Use this for initialization
     void Start () {
         
     }
 
     // Update is called once per frame
     void Update() {
         player = GameObject.FindGameObjectWithTag("Player").transform;
         ini = transform.parent.gameObject.transform;
         fim = transform.parent.Find("cam_F");
         speedfim = speed * Time.deltaTime;
 
         
 
         Vector3.SmoothDamp(transform.position, player.position,ref speedfim3d,temposuave);
 
         Mathf.Clamp(transform.position.x,ini.position.x,fim.position.x);
         Mathf.Clamp(transform.position.y, ini.position.y, fim.position.y);
         Mathf.Clamp(transform.position.z, ini.position.z, fim.position.z);
 
         //transform.position = Vector3.Lerp(transform.position, player.transform.position, speed * Time.deltaTime);
 
 
     }
 }*