You can lock directory with a password by using cPanel "Password Protected Directories" option.
1. Log into your cPanel account.
2. In the "Security" section, click on "IP Blocker" Icon.
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3. Under "Add an IP or Range" you should enter the IP Address you wish to block.
4. Click on the "Add" button.

Here is Example: Single IP Address: 192.168.0.1 Range: 192.168.0.1-192.168.0.40 Implied Range: 192.168.0.1-40 CIDR Format: 192.168.0.1/32 Implies 10...* -- 192.