EnemySpawner.cs

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

public class EnemySpawner : MonoBehaviour
{
    [SerializeField] private GameObject enemyPrefab;
    [SerializeField] private float minimumSpawnTime;
    [SerializeField] private float maximumSpawnTime;

    private float timeUntilSpawn;


    // Start is called before the first frame update
    void Awake()
    {
        SetTimeUntilSpawn();

    }

    // Update is called once per frame
    void Update()
    {
        timeUntilSpawn -= Time.deltaTime;

         // Check if player is within detection radius

        if (timeUntilSpawn <= 0)
        {
           Instantiate(enemyPrefab, transform.position, Quaternion.identity);
           SetTimeUntilSpawn();
        }

    }

    private void SetTimeUntilSpawn()
    {
        timeUntilSpawn = Random.Range(minimumSpawnTime, maximumSpawnTime);
    }
}