Terraform: Error acquiring the state lock

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# 誰がロックしているか確認
terraform force-unlock <LOCK_ID>

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# ロックIDを指定して解除
terraform force-unlock xxx-xxx-xxx

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aws dynamodb scan \
  --table-name terraform-locks \
  --filter-expression "LockID = :id" \
  --expression-attribute-values '{":id":{"S":"bucket/path/terraform.tfstate"}}'

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terraform {
  backend "s3" {
    bucket         = "my-terraform-state"
    key            = "prod/terraform.tfstate"
    region         = "ap-northeast-1"
    dynamodb_table = "terraform-locks"
    encrypt        = true
  }
}