[-] Mercerenies suggested:
Go to sleep, lucid dream a hand grenade into existence, wake up, and set the hand grenade off next to the door
You have a very vivid dream about a grenade. You could almost touch it...
The seeming reality of the grenade is shocking enough to wake you up, whereupon you realise that the grenade is not real and that you don't have the ability to summon items from your dreams into reality. That would be absurd.
[-] GV suggested:
Force the lock of the door using the paperclip you obtained.
It's not a lock, it's just a hole where a doorknob should be. The door doesn't even have a lock.
[-] Kepons suggested:
Pull the door
You attempt to locate another handle by which to pull the door. You find none.
[-] 2Create suggested:
Put your finger in the knobhole, bend it for grip and pull to open the door.
It works, the door opens.
[-] 2Create suggested:
Swear to get revenge on the guy who locked you up! The murder of an innocent plant cannot go unpunished!