Problem overview

Changes in alignment, wear, power, hardware condition, installation, or the key can produce similar symptoms. Do not force the lock.

Safe, non-destructive checks

Observe whether the symptom changes with the door open or closed. Check for visible looseness, low-battery warnings, and manufacturer error messages. Use only the exact model documentation.

When to request help

Stop if a key may break, the door cannot secure, hardware is visibly damaged, or the manufacturer procedure does not resolve the problem. Authorization must be confirmed for entry-related work.