How do you create a combination lock in Rec Room?
I produced a whole video on the topic of cheap dynamic password systems. Take a look this solves your problem and also shows how to construct a very cheap password checking and generating system and some advice on building a cheap input system.
The basic premise is a circuit that sequentially concatenates the user input and checks if it is equal to the key.
If you don't want to build it the invention featured in the video is called "cheap password".