You could try using CB AntiSpam as it has Blocking features. You'd set the date for the block (when the block goes in affect) to whatever you like. You can then set for how long they're blocked (1 day, 1 month, forever, etc..) and even specify a reason (will be displayed to the user on their next login attempt).

As an alternative I guess you could do something like that using CBSubs. You've create a subscription plan with the duration you're wanting (e.g. 1 year) and leave free registrations without subscriptions disabled (this is default). When the plan expires after a year for example their account will disable on next login attempt or when expirations are triggered.