Service. The third and most rickety leg of the tenure stool. No one ever got tenure for service, but it's counted all the same. Are you a good citizen of the department/college/university/community? In some cases pre-tenure service amounts to the equivalent of hazing, but if you can manage some say in what you take on you might actually find some worthwhile pursuits.
My advice to new faculty is to always get a feel for your options. You are going to be asked to do some service, so you will be best served if you can choose from among a few possibilities. Don't automatically say yes to the first thing that some senior faculty member "really thinks you would be good at" or "thinks you might benefit from". Spoiler: They are likely trying to off load something they don't want to do.
In your first few years, sticking to service roles in the department or college is a good idea. Chances are you won't be asked to do university-level service early on, anyway. But keep it to roles where you can see a tangible outcome in the somewhat near future.
Where do you think you could make a contribution without sinking dozens of hours that you don't want to spend? Do you want to help craft the undergraduate experience? Every department has a curriculum committee. Maybe you would prefer being on the grad committee? There could be an opportunity to serve on a college diversity committee and help promote that agenda. Are there hires being made in your general area? The opportunity to have a major say in the people who may be your colleagues for years to come is always time well spent. You get the idea.
There is nothing worse than getting stuck in a service role you dread. Yes, we all take one for the collective team once in a while, but no one deserves to have to attend monthly meetings of the University Manual committee, Chaired by Dr. Robert's Rules of Order. There's service and there's sacrfice. Choose the former and avoid the latter like the plague.