You can lock directory with a password by using the cPanel Password Protected Directories option.
1. Log into your cPanel account.
2. In the Security section, click on the 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.