I worked for a boss like that once for a very short time "VARY" he asked me that very question, he said work don't stop until 3:30 I said no problem, at 3:30 went and got in my truck and went to leave, he came out screaming that I didn't pick up his tools, I said nope and it ain't going to happen on my dime, told him to read the labor laws, and drove off, he called me for weeks trying to get me to come back.
Picking up the tools, cleaning the job site, and any other task where you do not have control over your time then you are on his clock, its in the labor laws, if he wants you to pickup or clean up after the end of the shift then he has to pay for this extra time as it is part of the job.
A good rule of thumb is treat your workers as you would want to be treated, be assertive and consistent about the rules and repercussions when they break the rules, being consistent with the rules and repercussions of breaking them will instill a clear understanding that they won't try to play games to see what they can get away with as a child will do with their parents, but always remember they are human just like you, and want to be treated with the same respect and trust that you want from them, if they are supposed to be already experienced then don't micro manage them as if they need this then you don't need them, give them a the task to do, tell them how you want it to be done, but don't stand over their shoulder and micro manage them, if they don't follow what you want then see if maybe your not communicating correctly, as communication break downs is one of the biggest ways to loose good employees and is one of the most common faults for workers not following what you want, I have wrote a few hand books for companies I have worked for, that spelled out what I expected from my workers under me, I wont micro manage someone because if I have to then I don't need that person if they claim to be a experienced electrician, if I have new inexperienced workers then I put them with someone who will work with them and keep an eye on them, but I always tell them to show them what to do and tell them to ask about anything they don't understand, check on them from time to time just to see if the job is going in the right direction and ask maybe if they have any questions, but the more respect and trust you give them to do the job correctly the more they will try to meet your expectations if they are an employee who is worth keeping.
My rules were just like I had for my kids, Do what is expected and everything is ok, do more then what is expected and I will reward you, do less and I will discipline, I usually have a fair margin to what is expected and what is above and below the expected level because I know we all do not work the same, but not getting work out because I see you just not trying or talking on your phone or goofing off then we will have a problem, I simply ask them if they are not interested in electrical work then they need to find a job that does interest them, as we all know we need to find work we like to do otherwise we will never excel at the level we need if we have no interest in what we are doing and matching workers with jobs they have an interest in goes a long way to getting and keeping good employees.
Sorry for the ramble just wanted to share some incite I have learned over the years