How did the legend of brothers and twins finally cross the river?

According to the legend of brothers and twins, the steps of crossing the river are as follows:

1. Walk along the road to the bridge and there will be a simple puzzle. Here, my brother's strength is far from enough, and he needs to turn the door handle.

Cross the river and walk on the right. Go to a broken ladder and ask my brother to help my brother up.

The younger brother will go to the rope and let the older brother go up. Later, we will turn the door handle next to the elevator.