Could be, but personally, I wouldn’t recommend it. While there are citizen’s arrest laws and I’m sure they’ve been used, I can’t think of any examples off the top of my head, and it appears each state has different standards that need to be met to constitute a “citizen’s arrest,” with some states not allowing/defining it.

Personally, my concern with attempting a citizen’s arrest would be doing so without meeting my state’s/country’s standard to do so. My state’s statute explicitly states it is a crime to illegally restrain someone against their will, and even states that doing so is skirting the line of kidnapping.

Having a kidnapping charge thrown at me doesn’t seem worth it for a jackass who doesn’t want to leave my property but isn’t doing anything else (like attempting to harm me or damage my property). I’d play it safe and just let the police handle it, their qualified immunity will let them do whatever they want and face no consequences anyway.

But again, IANAL, and YMMV, so do with all this as you will.