How to stop an object at a certain distance from another object?

Question

Unity

Good day, dear experts, please tell me how you can stop the object (player) at a certain distance from the collision.
For example: there are two objects on the stage, if the player is at a distance less than 30 from another object, then the object disappears.

Answer 1

if(Vector3.Distance(current.position, target.position) < 30)
{
    Destroy(target.gameObject);
}

Answer 2

stop or delete?