raises prices on all goods and services, they end up in the same place. it also makes small businesses less competitive and reduces the amount of jobs available, which means more unemployment and government support (which thailand doesn't have a lot of). it also doesn't address why they are in the bottom class to begin with. you can't raise minimum wage to bring people into a middle class, it just doesn't work.
if you care about helping poor people, you should focus on educating them on basic finances and ways to build/learn skills to make themselves more valuable.
artificially raising the floor of labor pricing just hurts the bottom and middle class