Let's assume the entire wage increase is passed on to the customers.

If I understand the figures correctly, a meal that now costs $30 will cost $30.90 instead.

That is no big deal---I will gladly pay that if it gets the workers closer to a living wage.

Many classes of service workers like domestic help, caregivers, landscapers etc. are now moving into the underground economy. When you factor in taxes, benefits, workers comp insurance and a small profit for a service firm or legitimate business operator the underground worker can make good money and pay no taxes with cash at a rate lower the the business owner. The irony is that the higher you make a minimum wage it actually creates economic incentives to work around the system and expand gig worker markets.

Bill: "the underground worker can make good money"

Care to specify your definition of "good money"?

Mountain View and Sunnyvale - IMO also showed their alignment with low-wage and minimum-wage worker families by being solidly for (all voting precincts) County School Board incumbent Grace Ma for Reelection. She in many peoples' views (a majority of Voters in her District) has a concern that manifests itself in her excellent support for poor family pre-K education through all of Santa Clara County.

I do not think MV with it's new Council will be in danger of curtailing it's past public policy efforts to "promote the general Welfare".

Alternatively, both employers and employees could decide what wage would be amenable to bother parties. But the difference between a low paying job and no job at all is vast.

About half of minimum wage workers are under 25, perhaps still picking up basic skills. About half also reside in non-poor households. The real minimum wage is zero, which the unemployed earn. When the employee fails to generate about double his or her wage, the job vanishes. When the min wage rises, people who are already employed have the best chance or remaining employed. The previously unemployed are more likely to remain unemployed. The "ins" may rise a little, the "outs" stay out.
It is convenient for pro-min wage research that the businesses that fail and the newly unemployed or still unemployed workers are so much harder to find and interview than are the surviving businesses and employees.