Key

The Guard Key is a tool that Guards spawn with that allows them to open any door in the prison when the Warden's alarm is not activated. Pretty self-explanatory.

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Razor + Screw

The Prisoner Key an escape method that allows you to open up any door in the prison, including Solitude. It works exactly like the Guard Key, and cannot be used while the Warden's alarm is activated.

This is the best method of escape on the official Escape Tier list. This is because you can open up any door in the prison and bust all of your friends out of prison without making noise besides your footsteps. This is an excellent method of an escape because it gets can get any Prisoner out of their cell or any location they are stuck in, and it is an excellent escort tool if you are leading a rebellion / jailbreak. This used to be an SS tier due to how overpowered it was, and several nerfs decided to follow de-ranking it to S tier. The first nerf was changing its level requirement from 3 to 5. Still overpowered, the minimum level was changed from 5 to 10. That brought the key from SS to SS-, resulting in the Warden alarm system being installed that allows it so when you sound the alarm, all doors are disabled and on lock-down, not allowing any doors to be opened by both Guards and Prisoners. Since it went from SS- to S+, one final nerf was done to it that removed the key from going into the inventory of Escaped Prisoners every time they spawned, resulting in it going from S+ to a regular S rank.