public class Controller : MonoBehaviour
{
    public HingeJoint leftJoint, rightJoint;

    private void Update()
    {
        if (Input.GetButton("INPUTPOURLAGAUCHE")
        {
            JointLimits limits = leftJoint.limits;
            limits.min = 90;
            limits.max = 90;
            leftJoint.limits = limits;
        }
        else
        {
            JointLimits limits = leftJoint.limits;
            limits.min = 0;
            limits.max = 0;
            leftJoint.limits = limits;
        }

        if (Input.GetButton("INPUTPOURLADROITE")
        {
            JointLimits limits = rightJoint.limits;
            limits.min = 90;
            limits.max = 90;
            rightJoint.limits = limits;
        }
        else
        {
            JointLimits limits = rightJoint.limits;
            limits.min = 0;
            limits.max = 0;
            rightJoint.limits = limits;
        }
    }
}