Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download QA Elevator (Programmed) Free.
QA Elevator (Programmed) v1.02 (Latest version)
QA Elevator – it’s not just a 3D-model, it’s a complete programmed elevator system, that will do all the necessary work for you. Just drag & drop the elevator prefab into your scene, copy it few times and that’s done. Works fine with any FPS controller and any number of floors.
This content is also included in the QA Office and Security Room pack.
The pack includes:
• Elevator model with a single material (atlased textures);
• Elevator script;
• Sound effects;
• Few wall signs;
• Assembled and lightmapped demo-scene.
BONUS modular set with appropriate textures:
If you have a minute I’ll be happy if you can rate this pack!