BlockRotation.cs

using UnityEngine;

public class BlockRotation : MonoBehaviour
{
    private bool _isOverlapped;

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.E) && _isOverlapped)
        {
            Debug.Log("Flip");
        }
    }

    private void OnTriggerEnter(Collider other)
    {
        _isOverlapped = true;
    }

    private void OnTriggerExit(Collider other)
    {
        _isOverlapped = false;
    }
}