Nowadays thieves have become tech savvy and stealing of cars has become high tech. With the modern keyless vehicles where ignition is by the use of a button, and locking of car doors is by the use of a key fob thieves have deviced new ways to counter this by using car jammers. Car jammers interfere with the signal from your key fob such that when you press your key fob to lock your car it will produce the normal locking sound but then it wont be locked. The thieves access your car and go and sell it. The car jammer also makes it hard to track your car since it interferes with the signals.
I dont have a car but once you lock your car especially in a public place ensure the doors are completely locked.
Common sence tells me that if I have the key fob in my pocket I just have to touch the door and it unlocks.
So it’s not possible to check if the doors are locked since a slight contact will simply unlock the door.