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Unfortunately there is not always an easy fix. You have tried everything already that can potentially solve the issue easily by resetting power and trying to start self clean and canceling it. If the latch won't unlock then this is not the same issue you had 5 years ago, the door latch has just failed and will need to be replaced. The latch motor assembly is mounted to the back of the oven just above the lower oven cavity so you can pull the unit out and remove the sheet metal panel on the back and try to wiggle the latch motor to see if you can get it to respond but other than that you need to replace the latch assembly.
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