This depends entirely on your state and lease terms. Unlike residential tenancies, commercial lockouts ("self-help eviction") are legal in some states:
- Texas: Commercial landlord self-help is explicitly permitted under the lease if the lease allows it.
- California: Generally prohibited — landlords must go through formal unlawful detainer even for commercial tenants.
- Most states: Fall somewhere in between — self-help may be permitted for commercial leases if done peaceably and the lease explicitly authorizes it.
Regardless of the lockout's legality, your landlord likely cannot hold your personal property (inventory, equipment) hostage. Most states have separate rules about landlord liens on tenant property, and many require a court order before the landlord can sell or dispose of it.
Immediate steps: (1) Review your lease for lockout/re-entry provisions, (2) send a written demand for access to retrieve your property, (3) if in a state that prohibits commercial self-help, contact a lawyer about emergency injunctive relief, (4) do NOT break in — that creates criminal liability for you.