what can open doors

without force
even the strongest man can not do it
only i

Based on your description, it seems that you are referring to a specific object or ability that can open doors without the need for force, and only you possess it. Unfortunately, I would need more information to understand exactly what you're referring to.

However, in general, there are various methods or objects that can be used to open doors without force, regardless of a person's physical strength. Here are a few possibilities:

1. Keys: Keys are commonly used to open specific doors that are designed to fit a particular lock. If you possess the correct key, you can unlock and open the door easily.

2. Electronic access cards: In modern buildings, doors are often equipped with electronic access systems, typically operated using access cards. These cards grant authorized individuals access to the door without the need to apply force.

3. Automatic doors: Some doors, particularly found in public places such as malls or hospitals, are equipped with motion sensors or buttons that activate the door to open automatically. In this case, you wouldn't need to apply any force.

4. Remote control: Certain doors, such as garage doors or electronic gates, can be opened remotely using a specific remote control device. If you possess the correct remote control, you can operate the door without applying any physical force.

It's worth noting that without further information about the specific object or ability you're referring to, it's difficult to provide a more accurate answer.