Recommendation for ‘password’ protection?

I really don’t want password protection. At work my manager (and former friend) knows the URL of my wordpress site. My site is really for staging, it is not real. The landing page is the doorway into my custom app. To get to my page you type (not real)

[staging.reachstudyonline.com](https://staging.reachstudyonline.com)

For example I want to limit who can actually get in by adding

[staging.reachstudyonline.com](https://staging.reachstudyonline.com)/enter

temporarily.

Is there some Plugin that will allow this or is there some easy way to do it in the WP dashboard?

 

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