Buttons in Unity, what are they, and how does it usually end?

Question

Unity

Problem. Let's say I have a button, when pressed, each frame should execute the code:

this.transform.Translate(0, speed * Time.deltaTime, 0);

How to do it? Standard OnClick doesn't want to execute this code every frame. The whole script looks like this:

using UnityEngine;

public class Movement : MonoBehaviour
{
    public float speed;
    // Start is called before the first frame update
    void Start()
    {
        
    }
    public void Left()
    {
        this.transform.Translate(0, speed * Time.deltaTime, 0);
    }
    public void Right()
    {
        this.transform.Translate(0, -speed * Time.deltaTime, 0);
    }
    void Update()
    {
        
    }
}

Thanks in advance!!!