Mine Shaft Escape

You are being chased by a radical horde of monster and you accidentally fall into a mine shaft. Eventually the monsters leave and get a bolder to throw down the hole and crush you. Luckily, you see a locked box with a ladder in it. The monsters are very slow so it will take them one hour to get the bolder to you and crush you with it. The monsters are not that strong so they can't get the bolder to the mine shaft in less than one hour. You have this one hour to escape the old gold mine. The box has seven locks and you need to unlock all of them to get the ladder out.