ShopColliderDetection.cs

using UnityEngine;
using TMPro;
using System.Collections;

public class ColliderChecker : MonoBehaviour
{
    public GameObject shopKeeper;
    public Canvas shopInstructionCanvas;
    public TMP_Text instructionText;
    public SaveRadius saveRadius;

    void Update()
    {
        // Check if the targetObject is within the collider of this GameObject
        if (!GetComponent<Collider>().bounds.Intersects(shopKeeper.GetComponent<SphereCollider>().bounds))
        {
            if ((Input.GetKeyDown(KeyCode.Z) || Input.GetButton("X Button")) && Time.timeScale == 1 && !saveRadius.playerInRange)
            {
                StartCoroutine(ErrorMessage());
            }
        }
    }

    IEnumerator ErrorMessage()
    {
        instructionText.text = "Shop is out of range";
        shopInstructionCanvas.gameObject.SetActive(true);

        yield return new WaitForSeconds(2f);

        shopInstructionCanvas.gameObject.SetActive(false);
        instructionText.text = "Press Z to open the shop";
    }
}