Get closest point on bounds (not within)

PointOnBounds.cs

    Vector3 GetClosestPointOnBounds(Bounds bounds, Vector3 point)
    {
        var boundPoint1 = bounds.min;
        var boundPoint2 = bounds.max;
        var points = new Vector3[] {
            new Vector3(boundPoint1.x, boundPoint1.y),
            new Vector3(boundPoint1.x, boundPoint2.y),
            new Vector3(boundPoint2.x, boundPoint2.y),
            new Vector3(boundPoint2.x, boundPoint1.y),
        };

        return new Vector3[]
        {
            GetClosestPoint(point, points[0], points[1]),
            GetClosestPoint(point, points[1], points[2]),
            GetClosestPoint(point, points[2], points[3]),
            GetClosestPoint(point, points[3], points[0]),
        }.OrderBy(l => l.sqrMagnitude).First();
    }

    Vector3 GetClosestPoint(Vector3 point, Vector3 line_start, Vector3 line_end)
    {
        Vector3 line_direction = line_end - line_start;
        float line_length = line_direction.magnitude;
        line_direction.Normalize();
        float project_length = Mathf.Clamp(Vector3.Dot(point - line_start, line_direction), 0f, line_length);
        return line_start + line_direction * project_length;
    }