Interim Patch is holding the lock from xxxxxxx

Opatch failed with the following message:

Problems with the lock file
Lock file exists, details are:
Interim Patch is holding the lock from xxxxxxx,
probably due to previous unsuccessful operation

ERROR: OPatch failed during pre-reqs check

Opatch creates patch_locked in $ORACLE_HOME/.patch_storage during running of patch. If for some reason opatch run was interrupted or canceled , this file may not be removed. As the result, further opatch run can find this patch and will fail because of this file.

To resolve, delete this file.