The door locks for commercial property??

[Veronica Joyner]

Hello all,

I have a small multi-unit (7units) on the Southside of Chicago.  Every three months my handyman is there replacing or fixing the door locks.  The locks are new, standard key entry from the outside for the backdoor.  Tenants gain entry through this door regularly.  The front entry is through 2 locked doors, first door is a buzz/key entry and the second door leading to the upper units is a buzz/key entry as well.

Can someone recommend a sturdier product while maintaining the same locked/buzz in secure entry?

Thanks