If you need a quick and easy way to protect your Admin Panel well... use Login-GroceryCrud!
No registration form, no lost password, just Login.
Note: the user will be managed by GroceryCrud, so you need to create the page for the management of the users BUT you can find it in the WIKI of the github project so just copy and paste :)
Note 2: the user table will be create automagically, so you don't need to care about it :)
Please give me your feedback, I will happy to hear your experience with Login-GroceryCrud!