A Door that opens when i have all keys (9 papers)

Unity Answers does not write or provide scripts for you. There are many door opening/closing scripts on Unity Answers. Try them out. If you get get stuck, post back with your script. Also consider using an Animation rather than a script.

For future questions, please post your code into the question. Be sure to select your code and use the 101/010 button to format it.

Please post that script in your post. Also, that script is not enough to check why the door is not opening.