Will people that don’t have a remote control be able to operate the door?

Yes, the door will function normally when manually used. For the Model 133, that means the door is free-swinging (no resistance is felt). For the Model 233, that means that the door will feel like it has a spring closer on it (a light resistance to opening is felt), and it will close when let go. The Model 233 usually replaces a spring closer on the door.