Chicago passed a law in October that, among other things, mandates employers provide a panic button that hotel workers can use to call hotel security if they feel unsafe. That provision was added after a UNITE HERE survey in Chicago found that 96 percent of housekeepers would feel safer with a panic button.
https://www.citylab.com/equity/2018/01/the-local-fight-to-end-sexual-assault-in-low-wage-jobs/547553/