It need to be done with rigidbodies. Attach one to your door, and use this script: `// this script pushes all rigidbodies that the character touches
var pushPower = 2.0;
function OnControllerColliderHit (hit : ControllerColliderHit)
{
var body : Rigidbody = hit.collider.attachedRigidbody;
// no rigidbody
if (body == null || body.isKinematic) { return; }
// We dont want to push objects below us
if (hit.moveDirection.y < -0.3) { return; }
// Calculate push direction from move direction,
// we only push objects to the sides never up and down
var pushDir = Vector3 (hit.moveDirection.x, 0, hit.moveDirection.z);
// If you know how fast your character is trying to move,
// then you can also multiply the push velocity by that.
// Apply the push
body.velocity = pushDir * pushPower;