Charging labor costs for landlord repairs?

[Alexander Kleyman]

Recently tenant's BF broke the lock & handle on the storm door while trying to get inside after a breakup. Cops were there, drama ... I am handy and will replace the handle myself. I will be billing the cost of repairs to the tenant but I am wondering how everyone handles charging for your labor? I am not trying to profit off this, but my time is valuable (~1hr of work+travel) and all actions have consequences  - I want the tenant to understand this. I already re-keyed her deadbolt lock myself free of charge. How do you guys handle this? What is a reasonable handyman/landlord repair hourly rate?