. - Inform them that you will be bringing a locksmith with you to the site visit.- The tenant will be responsible for any damages and fees incurred in attempting to access the building if they are not present and the locksmith has to provide access to the building without keys or the tenant simply opening the doors.- In addition to performing the repairs on the property, you will be changing the locks, keeping a key for yourself, and giving fresh keys to the tenant.- If it turns out that any modifications were made to the locks by the tenant without your permission, they will be charged for the costs of changing out the locks. - The tenant, per the terms of your lease, is not permitted to make further changes to the locks or entryway without express permission from you, the landlord.  

Have them to leave the keys in a designated location get there first thing in the morning with a locksmith and move on.

I ended up having to call a locksmith to get me into my apartment which cost $250!

If you go that route, have someone there to remove his belongings for him along with a locksmith to change the locks at the same time. 

It will say how many days you must wait until you legally use a locksmith to enter in your units under emergency.

Do I arrange tow trucks for that date (along with locksmith for house)?

Assuming you have an entry clause...  24 hour notice during normal business hours and I will be there with a locksmith. 

If a tenant locks themselves out, I have a spare to sign out to them or I can go open the door (there's a fee, but it's cheaper than a locksmith).If I sign out one key and it hasn't been returned yet, I still have a second in the office for an emergency.

There is the old story about a driver who locked his keys in the vehicle and had to call a Locksmith to open the door to the vehicle.

If the tenant isn't available to let them in, I need to call a locksmith on top of it.