I know the feeling.
I worked in a shipyard building navy destroyers.
I was working on the aft gun auto loader.
I was working in the tube from the ammo loading compartment to the gun. Put a shell on the tray, push the button, and it’s loaded into the gun in a few seconds.
The welder/fitter was guarding the button to make sure no one pushed it sending the loading tray up.
Some clown came in the compartment grabbed the control buttons and started acting like he was going to push the button.
The welder/fitter went nuts and started fighting with the guy.
Had he pushed that button I would have been loaded into that gun just like a shell.
After that we made them shut down that entire section of the ship and made the safety crew place a guard outside the door to make sure no one else came in while we were working.
I know when I work on things like that, and its mostly around mobile units, I pull the wire for the injection pump. That and the key. Then lock the clutch handle so they cant throw the thing in gear.
When I worked in sawmills, I would have the electrician pull the fuses, if there were any, and, or have him lock the panel with my lock on with his and stand there.