How can I explore and/or modify Apache httpd's DAVLock file?

I have an Apache httpd server running mod_dav (and mod_dav_fs) and I have what appear to be stale locks on files that I'd like to manually expire.

I can see the DAVLock file on the disk, and the documentation says that the file is an SDBM file, but I haven't managed to find any tools that can read the file.

I'm running on Debian Linux. The file utility tells me that this file is a Berkeley DB (Hash, version 9, native byte-order) file.

I don't mind writing my own utility as long as I get some pointers as to how to read/write these files. Any ideas?