Two efforts that could lead to higher minimum wages took big steps this week. On Friday, Denver Mayor Michael Hancock signed an ordinance that will raise the floor wage for both city workers and city contractors to $15 per hour. The move will give pay boosts to nearly 1,900 city workers — the vast majority of whom work in the parks and recreation department — and an undetermined amount of workers with companies that have about 300 contracts in place with Denver. “The wage gap has kept people…