I'm looking for a service or third party solution that allows for granting temporary access to an IAM user (or group) to one or more services in an AWS account.

The example I have is there is an outage in a production account, and I would like to grant temporary access to developers/sys admins to resolve the issue. Under normal circumstances, they would not have access to this particular service/account.

Ideally, I would like this to me a managed off the shelf solution vs something like STS, which would require quite a bit of configuration. Example, a system outage occurs for unknown reasons in a production account that the on call SRE does not normally have access to. A manager or lead should quickly be able to temporarily escalate privileges for the user until the "firefight" is resolved.