Insert your second string into your first loop. Continue holding the crossed string at the base of your fist loop. Pull your second loop gently through the first, while releasing your hold on the crossed base of the second loop. Releasing the crossed base of the first loop while continuing to pull your second loop through.
Holding the string firmly where it feeds into your first loop and where it emerges from your second loop. Pull the loop and the start/end lines taut to tighten and finish your slip knot.
Get a finger-hold on the door, or have a friend do so, and pull lightly on it to relieve pressure and create a small gap between the door and car frame. Professional locksmiths often use a plastic tool to pry the door open slightly. A rubber wedge is then slid between the door and frame of the car and inflated to keep the door/door seal from getting in the way. [6] X Research source If you use a tool to try to pry your door free and make space for your string, this may cause damage to your paint or, if excessive force is used, could even damage your car door.
Once you have lassoed the door lock, maintain even pressure on your string to tighten your slip knot around the lock. Loosening your grip might cause the knot to loosen, requiring you to lasso the lock again.
