I doubt it is locked, unless the computer belongs to a company and not you, or you bought it used from somewhere.
It can, however, be set to fast boot, which will make the BIOS not accessible when you start up the computer.
To Turn On or Off Fast Startup in System Settings
1. Go to 'Control Panel' and click on the "Power Options icon".
2. Click "Choose what the power buttons do" on the left side.
3. Click "Change settings that are currently unavailable".
4. If prompted by UAC (User Account Control), click "Yes".
5. Do step 6 or step 7 below for what you would like to do.
6. To Turn On Fast Startup.
6a. Under "Shutdown settings", check the "Turn on fast startup box", click "Save changes", and go to step 8 below.
7. To Turn Off Fast...