Things like mice tend to use microswitches that are soldered onto the circuit board. It's a mechanical switch and while typically quite reliable, they can fail in a couple of ways. First and most common is they simply break free of the circuit board (or place where they're secured) and when you go to press the switch not just the shaft of the switch moves, but the whole switch moves. If the switch button is depressed and stays depressed, that's most likely the problem. Can it be fixed? Yes. But only if you're handy with a soldering iron and since you're posting the question, you probably aren't handy with a soldering iron. (This is a fairly common issue with the shoulder buttons on the Nintendo Switch. If someone has a Nintendo Switch with a broken shoulder button, the switch coming loose from the board is the typical reason.) Soldering the loose switch back into place isn't typically a big job, but it takes time and time is money for those who do this sort of thing.
If you're comfortable handling a soldering iron and you can get into the mouse (often the hardest part of the job) you'll typically find this is the problem and it's very easy to repair, just solder the switch back into place and you're back in business. If the switch is still intact on the board and not working then unsoldering it and taking the badly behaving switch to the nearest Radio Shack or electrical parts supplier to see if they have something comparable that you can then solder back in can often correct the problem.
Getting into things like wireless mice is often easiest if you have a specialized tool kit like those made by ifixit and similar companies. They typically include things like spudgers that let you safely pry apart the interlocking halves of things like mice, remote controls, etc. They also typically include the unique screwdrivers some manufacturers like to use to prevent people from opening their devices (Nintendo and Apple being two prime examples.)
Much of modern electronics is pretty easy to fix if you can just get to it. The hot air soldering devices have even come down enough in price to make them affordable for DIYer's. Those are vital for removing/installing things like surface mounted devices. Instead of heating up one distinct spot with a soldering iron, they'll heat up a whole area allowing you to remove a chip or surface mounted component in little time with little trouble.
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