void SwitchState(PickableStates pickableStates)
    {
        PickableState = pickableStates;

        switch (PickableState)
        {
        case PickableStates.CanBePickedUp:
            _boxCollider.isTrigger = false;
            _rigidBody.isKinematic = false;
            _rigidBody.useGravity  = true;
            break;

        case PickableStates.CantBePickedUp:
            _boxCollider.isTrigger = true;
            _rigidBody.isKinematic = true;
            _rigidBody.useGravity  = false;
            break;
        }
    }
 void Start()
 {
     PickableState = PickableStates.CanBePickedUp;
 }