...........After getting permission to get out of, or am asked to get out of my car, I lock it, removing my immediate access to the interior of my car..............
One does not 'get permission' to get out of your car. One is ordered to stay in or get out. Those are the only two options you will be given.
But if you really want to get gutsy, as soon as you see you're getting pulled over, roll up all the windows. When your car comes to a stop, get out, toss your keys on to the dash, lock the doors and shut it. This forces the police to get a search warrant to enter it.
As a side note: whether one is or isn't a lawyer is not relevant. US laws are public record and open to anyone who cares to read them. Once does not need to be a lawyer (or a sworn peace officer for that matter) to know the laws.
Ever hear the phrase "Ignorance of the law is no excuse"? This phrase has two ironies. One, LEOs love to shove it down the throats of those we are ignorant of the laws, yet seem to think you're
supposed to be ignorant, the better their chances of putting a notch in their gun handle.
The second irony is the phrase originated in a 1917 legal case concerning disbarring a practicing lawyer (re McCowan 1917 ,177 C. 93, 170 P. 1100). The original court ruling wording is: "Of course, ignorance of the law does not excuse misconduct in anyone, least of all in a sworn officer of the law."