Everyone involved except the jurors get paid full rate. Judge, prosecutors, lawyers, law enforcement, expert witnesses, clerical staff, bailiffs, etc. If it's truly a "duty", they too should work for 1940s pay rates.

Easiest way to be exempted beforehand is "Financial Hardship", which for many is the truth. $9 per day ($25 starting the 4th day) is appalling. 17 cents milage and no paid meals, though parking may be free.

Jury nullification is another way. If doing this directly, keep it discreet. Better to mention it on a questionnaire. Some try to use the "don't trust police", etc excuse, but that surprisingly doesn't always work.

Another way is being overly well dressed. Suit and tie along with high-end shoes, etc. For a civil trial is a toss-up, but for a criminal trial, can be pretty effective from what I've been told.

Ultimately it comes down to the population of a particular county and case load. In some, a large proportion of civil cases never get to court and many criminal defendants pleading out. Less cases, less chance of being called let alone serving. Also, more likely ignored jury duty notices won't be pursued and being excused will be easier.