This is an accepted solution.
The pending invoice would need to be paid in order for the store to be closed. However, depending on the charges, we may be able to remove the pending charges to help you close your account. Please reach out to our Support for further assistance with this.
While we’re not able to provide account-specific support via the Shopify Community at this time, we’d be happy to continue assisting you through live chat, email, or callback. Please visit https://bit.ly/3cJkx8V and log in to your account to create a support request.
Since this is the next step I've marked this reply as the solution for the benefit of others who may discover this topic. Thanks!