A pair of wire cutters will be the cheap option.
Not to mention the airports that you can walk to the end of the security fence then then step over a 3 strand wire fence.
Or one other I know where you can reach under the automatic gate with a shifter and undo the bolt holding the electric operating arm.
Or another where a sharp push will overcome the magnetic lock.
The whole thing is a sham and a farce that only serves to create more jobs in Canberra.