QB Issue Resolution:

In company settings>advanced , use close the books and set a password

that is all that QB close the books does, it is not an account entry close the books

Resolution for Issue 'How do you lock a period in Quickbooks?' available: Yes (Solved).
Source: Intuit Community forum.

How do you lock a period in Quickbooks?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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